[go: up one dir, main page]

WO2025187223A1 - Procédé d'inspection visuelle, système d'inspection visuelle et programme d'inspection visuelle - Google Patents

Procédé d'inspection visuelle, système d'inspection visuelle et programme d'inspection visuelle

Info

Publication number
WO2025187223A1
WO2025187223A1 PCT/JP2025/001550 JP2025001550W WO2025187223A1 WO 2025187223 A1 WO2025187223 A1 WO 2025187223A1 JP 2025001550 W JP2025001550 W JP 2025001550W WO 2025187223 A1 WO2025187223 A1 WO 2025187223A1
Authority
WO
WIPO (PCT)
Prior art keywords
inspection
subject
test image
visual
sensitivity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/001550
Other languages
English (en)
Japanese (ja)
Other versions
WO2025187223A8 (fr
Inventor
雅文 矢野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iris Communication KK
Nico Corp
Original Assignee
Iris Communication KK
Nico Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iris Communication KK, Nico Corp filed Critical Iris Communication KK
Publication of WO2025187223A1 publication Critical patent/WO2025187223A1/fr
Publication of WO2025187223A8 publication Critical patent/WO2025187223A8/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
    • A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
    • A61B3/032—Devices for presenting test symbols or characters, e.g. test chart projectors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
    • A61B3/06—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing light sensitivity, e.g. adaptation; for testing colour vision

Definitions

  • the present invention relates to a visual inspection method, a visual inspection system, and a visual inspection program.
  • Human visual characteristics include visual acuity, which is the ability to recognize the presence and shape of objects and images, brightness characteristics, and color vision characteristics, which indicate sensitivity to color. These visual characteristics vary from person to person and change with age and the environment.
  • Known disorders related to human visual characteristics include vision-related disorders such as myopia, presbyopia, and astigmatism, brightness-related disorders such as photosensitivity, which makes certain wavelengths of light dazzling, and color vision-related disorders such as color blindness and color weakness, which cause low sensitivity to light in certain wavelength bands. Decreased visual acuity can be corrected with glasses or contact lenses. Brightness and color vision-related disorders can be alleviated by using optical filters with adjusted light transmission characteristics.
  • Patent Document 1 A method for testing and correcting color vision characteristics is disclosed, for example, in Japanese Patent Laid-Open Publication No. 6-18819 (hereinafter referred to as Patent Document 1).
  • color vision characteristics are classified into 32 types based on the test results of multiple patients.
  • the color vision characteristics of the subject being tested are then tested to determine which of the 32 types they fall into.
  • the subject's color vision deficiency can be alleviated by using an optical filter whose characteristics are determined based on the test results.
  • the color vision testing method described in Patent Document 1 determines which of several predetermined categories the subject's color vision characteristics fall into. As a result, there is a problem in that accurate test results cannot be obtained for subjects whose color vision characteristics do not fall into any of the predetermined categories, or for subjects whose color vision characteristics fall between multiple categories. Furthermore, while the color vision testing method described in Patent Document 1 alleviates the subject's color vision characteristics, it does not correct their eyesight.
  • the subject has photosensitivity, it may be difficult for the subject to see the optotype used to test their visual acuity, and their visual acuity may not be measured accurately. Furthermore, if the subject has color weakness or color blindness, they may have difficulty recognizing the color of the optotype, and their visual acuity may not be measured accurately. Therefore, even if the subject's visual acuity, the luminance of the optotype, and their sensitivity to color are tested separately, it is not possible to accurately test the subject's visual acuity, and the subject's visual acuity cannot be appropriately corrected, which is a problem.
  • the present invention was made in consideration of the above circumstances, and its purpose is to provide a visual testing method, visual testing system, and visual testing program that can more accurately test the subject's visual acuity.
  • a visual acuity testing method for visual characteristics is a visual acuity testing method that measures the visual acuity of a subject using a test image.
  • Types of test images include visual acuity test images, which include a visual target for measuring the visual acuity of the subject and a background area surrounding the visual target, with the visual target having a color different from the color of the background area.
  • the visual acuity testing method includes a visual acuity test image presenting step that presents the visual acuity test image to the subject, a visual acuity test image modifying step that modifies at least one of the brightness and color of the visual acuity test image, and a visual acuity measuring step that measures the visual acuity of the subject by testing whether the subject can recognize the visual target when looking at the visual acuity test image.
  • a visual characteristics visual testing program causes a computer to execute a method including: a visual acuity test image presenting step of presenting to the subject a visual acuity test image including a visual target for measuring the visual acuity of the subject and a background area surrounding the visual target, wherein the visual target has a color different from the color of the background area; a visual acuity test image modifying step of modifying at least one of the brightness and color of the visual acuity test image; and a visual acuity measuring step of measuring the visual acuity of the subject by testing whether the subject can recognize the visual target when looking at the visual acuity test image.
  • the visual testing system includes a visual acuity test image presenting unit that presents the visual acuity test image to the subject, a visual acuity test image modifying unit that modifies at least one of the brightness and color of the visual acuity test image, and a visual acuity measuring unit that measures the visual acuity of the subject by testing whether the subject can recognize the optotype when looking at the visual acuity test image.
  • Embodiments of the present invention provide a visual testing method, a visual testing system, and a visual testing program that can more accurately test a subject's visual acuity.
  • FIG. 1 is a schematic diagram of a visual inspection system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of the absorption spectra of human cone cells (S cone cells, M cone cells, L cone cells) and rod cells.
  • FIG. 3 is a diagram showing human photopic vision and scotopic vision.
  • FIG. 4 is a diagram showing an example of a sensitivity test image according to an embodiment of the present invention.
  • FIG. 5 is a diagram showing an example of a visual acuity test image according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of a visual inspection method according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of a correction filter according to an embodiment of the present invention.
  • FIG. 8 shows the bandwidth of a correction filter according to an embodiment of the present invention.
  • FIG. 9 is a diagram showing an example of the characteristics of the correction filter according to the embodiment of the present invention.
  • FIG. 10 is a diagram showing an example of the characteristics of the correction filter according to the embodiment of the present invention.
  • FIG. 11 is a diagram showing an example of the characteristics of the correction filter according to the embodiment of the present invention.
  • FIG. 12 is a schematic diagram of a visual inspection system according to a modified embodiment of the present invention.
  • FIG. 13 is a front view of an eye chart according to a modified embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a visual inspection system according to a modified embodiment of the present invention.
  • FIG. 15 is a schematic diagram of a visual inspection system according to a modified embodiment of the present invention.
  • FIG. 16 is a schematic diagram of a visual inspection system according to a modified embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a vision testing system 1 for performing a vision test according to one embodiment of the present invention.
  • the vision testing system 1 is used to test the visual characteristics of a subject 2.
  • the visual characteristics include visual acuity, color vision characteristics, and characteristics related to brightness.
  • the vision testing system 1 includes a display device 10, a phoropter 20, a control unit 30, and an operation unit 40.
  • the display device 10 is, for example, a liquid crystal display or a CRT (Cathode Ray Tube) display.
  • Test images such as a sensitivity test image 110 and a visual acuity test image 120 are displayed on the display device 10.
  • the display device 10 is not limited to displaying images in response to image signals, such as an LCD display, as long as it can show the test image to the subject 2.
  • the display device 10 may be equipped with a film on which the test image is printed and a backlight that shines light onto the film, and present the test image to the subject 2 by shining the light onto the film.
  • the test image may also be printed on paper or a board.
  • a known phoropter 20 is placed between the subject 2 and the display device 10.
  • the phoropter 20 is used to measure the subject 2's visual acuity, degree of astigmatism, and direction of the astigmatism axis.
  • the examiner performing the visual characteristics test attaches trial lenses 21 with different powers and degrees of astigmatism correction to the phoropter 20, and the subject 2 views a visual acuity test image 120 through the trial lenses 21.
  • the subject 2 views the visual acuity test image 120, allowing the subject 2's visual acuity and degree of astigmatism to be tested.
  • the phoropter 20 is an example of a visual acuity measurement unit.
  • the visual acuity test image 120 is an example of a visual acuity test image.
  • the control unit 30 comprises a CPU 31, a memory area 32, and an image signal generation unit 33.
  • the memory area 32 stores the test program used for the visual test and data on the test image to be displayed on the display device 10.
  • the CPU 31 causes the image signal generation unit 33 to output an image signal for the test image based on the test image data stored in the memory area 32.
  • the display device 10 displays the test image in accordance with the image signal output from the control unit 30.
  • the operation unit 40 is operated by the examiner and accepts operations to specify or change the test image to be displayed on the display device 10.
  • the CPU 31 is an example of a computer.
  • the display device 10 is an example of a visual acuity test image presenting unit and a sensitivity test image presenting unit
  • the control unit 30 is an example of a visual acuity test image changing unit and a sensitivity test image changing unit.
  • the control unit 30 is also an example of a condition acquisition unit.
  • the examiner operates the operation unit 40, causing multiple test images to be displayed sequentially on the display device 10.
  • the subject 2 views the test images through the phoropter 20.
  • the subject 2 is then tested to see how dazzling the sensitivity test image 110 is (i.e., the subject 2's degree of photosensitivity), how the subject 2 perceives the color of the sensitivity test image 110 (i.e., the subject 2's color vision), and whether the subject 2 can recognize the presence and shape of the optotype 121 included in the visual acuity test image 120 (i.e., the subject 2's visual acuity).
  • the test results may be stored in the memory area 32.
  • the sensitivity test image 110 is an example of a sensitivity test image.
  • a correction filter can be created based on the test results to correct the subject's visual characteristics. This correction filter corrects subject 2's visual acuity. Furthermore, if subject 2 has photosensitivity, color weakness, or color blindness, the correction filter not only corrects the subject's visual acuity, but also makes corrections to reduce the impact of subject 2's photosensitivity, color weakness, or color blindness on their visual acuity.
  • Figure 2 shows an example of the absorption spectra of human cone cells (S cone cells, M cone cells, L cone cells) and rod cells.
  • the horizontal axis of Figure 2 represents the wavelength of light, and the vertical axis represents the absorption rate of each cone cell and rod cell.
  • "S,” “M,” “L,” and “Rod” in Figure 2 represent the absorption spectra of S cone cells, M cone cells, L cone cells, and rod cells, respectively.
  • Each absorption spectrum shown in Figure 2 is normalized by the maximum absorption rate. The higher the absorption rate of each cone cell and rod cell, the higher its sensitivity (susceptibility) to that light.
  • S cone cells have maximum sensitivity around 420 nm.
  • M cone cells have maximum sensitivity around 534 nm.
  • L cone cells have maximum sensitivity around 564 nm.
  • Rod cells have maximum sensitivity around 498 nm. Note that the wavelengths at which each cone and rod cell is most sensitive vary from person to person.
  • Figure 3 shows human photopic and scotopic vision.
  • the horizontal axis of Figure 3 represents the wavelength of light, and the vertical axis represents a person's sensitivity to each wavelength.
  • Photopic vision is represented by a solid line
  • scotopic vision is represented by a dashed line.
  • a person's sensitivity to light differs between bright and dark places. Because photopic vision is primarily the responsibility of cone cells, in bright places, people are thought to recognize color using M and L cone cells, while the remaining S cone cells recognize the brightness of light. On the other hand, because scotopic vision is primarily the responsibility of rod cells, in dark places, people are thought to recognize the brightness of light using these rod cells.
  • the sensitivity test image set is a set of a plurality of sensitivity test images 110 displayed on the display device 10.
  • FIG. 4 shows an example of the sensitivity test image 110.
  • the sensitivity inspection image 110 has an inspection area 111 located near the center of the sensitivity inspection image 110, and a peripheral area 112 located around the inspection area 111.
  • the inspection area 111 is the area surrounded by a dashed line. This dashed line is drawn for the purpose of explaining the inspection area 120, and is not included in the sensitivity inspection image 110.
  • the inspection area 111 and the peripheral area 112 have different colors.
  • the peripheral area 112 has a circular shape.
  • the outer area 140 further outside the peripheral area 112 is black.
  • the inspection area 111 corresponds to the fovea centralis on a human retina.
  • the size of the inspection area 111 is set so that light emitted from the inspection area 111 is focused within the fovea centralis.
  • the size of the inspection area 111 is set so that the apex angle ⁇ IN (see FIG. 1 ) of a cone with the inspection area 111 as the base and the eye of the subject 2 as the apex is approximately 2 degrees.
  • This apex angle ⁇ IN of approximately 2 degrees corresponds to the width of the field of view (i.e., the field of view angle) of the fovea centralis.
  • the diameter of the inspection area 111 varies depending on the distance between the subject 2 and the display device 10 of the visual inspection system 1.
  • the size of the inspection area 111 needs only to be set so that light emitted from the inspection area 111 is focused within the fovea centralis, and the apex angle ⁇ IN does not need to be exactly 2 degrees.
  • the apex angle ⁇ IN may be greater or less than 2 degrees.
  • the peripheral region 112 corresponds to the region surrounding the fovea centralis on a person's retina.
  • the size of the peripheral region 112 is set so that light emitted from the peripheral region 112 forms an image outside the fovea centralis on a person's retina.
  • the size of the peripheral region 112 is set so that the apex angle ⁇ OUT (see FIG. 1 ) of a cone with the peripheral region 112 as the base and the eye of the subject 2 as the apex is approximately 40 degrees (see FIG. 1 ).
  • the fovea centralis is the center of the visual field (0 degrees)
  • rod cells are mostly located in the vicinity of ⁇ 20 degrees.
  • the apex angle ⁇ OUT of the peripheral region 112 be set to 40 degrees or more so that light emitted from the peripheral region 112 forms an image on the rod cells.
  • the shape of the peripheral region 112 is not limited to a circle. If the display screen of the display device 10 is rectangular, the entire display screen except for the test region 111 may be the peripheral region 112.
  • the fovea of the human retina is home to many M cone cells, which are sensitive to green light, and many L cone cells, which are sensitive to red light.
  • the fovea also contains very few S cone cells and rod cells.
  • the area outside the fovea contains S, M, and L cone cells, as well as rod cells.
  • Human vision is improved when the fovea is used.
  • people view objects, images, or text they primarily use the M and L cone cells located in the fovea to recognize the shape and color of the object.
  • people are able to recognize color using only the M and L cone cells.
  • people recognize not only color but also brightness by using the S and M cone cells and rod cells around the fovea.
  • it is possible to test a person's color vision by conducting a visual test targeting the M and L cone cells in the fovea.
  • it is possible to test the degree of light sensitivity by conducting a test targeting the fovea and the S cone cells and rod cells around the fovea.
  • the test region 111 is an area used to test color vision using the M and L cone cells in the fovea.
  • the color of the test region 111 differs from the color of the peripheral region 112 in at least one of the R, G, and B components in RGB color space.
  • the peripheral region 112 is achromatic. That is, the magnitudes of the R, G, and B components in RGB color space are the same in the peripheral region 112. This is because if a chromatic color were used in the peripheral region 112, the color of the peripheral region 112 could affect the color vision test using the test region 111.
  • the color of the peripheral region 112 must include a color to which the rod cells are sensitive.
  • the color of the peripheral region 112 is a color other than black (i.e., the magnitudes of the R, G, and B components are zero).
  • the color of the peripheral region 112 may also be white.
  • the peripheral region 112 does not need to be a uniform color throughout, and may include areas of relatively low and high brightness.
  • the sensitivity test image set includes multiple sensitivity test images 110 whose test regions 111 or peripheral regions 112 have different colors.
  • the sensitivity test image set includes 345 types of sensitivity test images 110 whose colors are different from one another.
  • the set includes 115 types of sensitivity test images 110B whose blue component colors are different from one another, 115 types of sensitivity test images 110R whose red component colors are different from one another, and 115 types of sensitivity test images 110G whose green component colors are different from one another.
  • the sensitivity test image 110B is a sensitivity test image for testing the subject 2's sensitivity to blue light.
  • the sensitivity test image 110R is a sensitivity test image for testing the subject 2's sensitivity to red light.
  • the sensitivity test image 110G is a sensitivity test image for testing the subject 2's sensitivity to green light.
  • the colors of the multiple sensitivity test images 110B, whose peripheral regions 112 are different from one another, are set so that the brightness of the peripheral regions 112 changes in 5% or 10% increments, for example.
  • the colors of the multiple sensitivity test images 110G, whose peripheral regions 112 are different from one another, are set so that the brightness of the peripheral regions 112 changes in 5% or 10% increments, for example.
  • the colors of the multiple sensitivity test images 110R, whose peripheral regions 112 are different from one another, are set so that the brightness of the peripheral regions 112 changes in 5% or 10% increments, for example.
  • the brightness increments of the peripheral regions 112 are not limited to 5% or 10%, and may be continuously variable, for example.
  • the sensitivity test image 110 is displayed on the display device 10, the sensitivity test image 110 is subjected to gamma correction according to the gamma value of the display device 10 before being displayed.
  • the input value of the image signal input to the display device 10 is x
  • the output value (luminance) is y
  • the gamma value of the display device 10 is ⁇
  • the RGB components of the sensitivity test image 110 are input values (xR, xG, xB) to the display device 10, and each input value is expressed in 256 gradations from 0 to 255.
  • the RGB components of the peripheral region 112 are input values ( xRBG , xGBG , xBBG ) to the display device 10, and each input value is expressed in 256 gradations from 0 to 255.
  • Table 1 shows the input values ( xRBG , xGBG , xBBG ) of the peripheral region 112 and the input values (xR, xG, xB) of the inspection region 111 of 115 types of sensitivity inspection images 110B.
  • “Brightness of surrounding area [%]” represents the brightness when the brightness when the surrounding area 112 is white (i.e., the input value is (255, 255, 255)) is set to 100%.
  • “Color components of surrounding area” indicates the input values ( xRBG , xGBG , xBGB ) for the brightness [%] of each surrounding area 112.
  • there are 11 types of surrounding areas 112B (5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%).
  • the surrounding areas 112B are achromatic, so the RGB color components in each surrounding area 112 are the same size.
  • the "Difference [%] of the blue component of the figure from the surrounding area" in the table represents the difference in the brightness of the blue component of the inspection area 111 from the brightness of the blue component of the surrounding area 112, assuming that the brightness of the blue component of the surrounding area 112 is 100%.
  • the size of the red and green components of the surrounding area 112 are the same as the size of the red and green components of the inspection area 111, respectively. Therefore, when the difference in the blue component of the inspection area 111 from the surrounding area 112 is 0%, the inspection area 111 and the surrounding area 112 are the same color, and therefore are not included in the sensitivity inspection image 110B.
  • a sensitivity inspection image 110B is a combination of a peripheral region 112 and an inspection region 111 that has an input value listed in the same column as the peripheral region 112.
  • the input values of the peripheral region 112 are (255, 255, 255)
  • the red and green components of the inspection region 111 of these six types of sensitivity inspection images 110B are the same size as the red and green components of the peripheral region 112 (i.e., both are 255).
  • the blue input values of the inspection region 111 of these six types of sensitivity inspection images 110B are set so that their brightness changes in 10% increments from -60% to -10% relative to the blue input value of the peripheral region 112.
  • the input values of the blue color in the inspection area 111 of the six types of sensitivity inspection images 110B, in which the input values of the surrounding area 112 are (255, 255, 255), are 168, 186, 202, 217, 230, and 243, respectively.
  • the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is a positive value (+10% to +60)
  • the magnitude of the blue component is greater than the red and green components, and therefore the inspection area 111 has a bluish color.
  • the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is a negative value (-10% to -60)
  • the red and green components are greater than the blue component, and therefore the inspection area 111 has a yellowish color (a color with strong green and red hues).
  • Subject 2 with normal color vision can easily recognize the color difference between test area 111 and surrounding area 112 even when the absolute value of the difference [%] of the blue component from surrounding area 112 is small.
  • the absolute value of the difference [%] of the blue component from surrounding area 112 needs to be large.
  • Subject 2 with normal color vision can recognize test area 111 within surrounding area 112, for example, when the absolute value of the difference [%] of the blue component from surrounding area 112 is 30% or more (i.e., -30% or less or +30% or more).
  • subject 2 who has low sensitivity to blue light will not be able to recognize the test area 111 even if the absolute value of the difference [%] of the blue component from the surrounding area 112 is 30%, but will be able to recognize the test area 111 within the surrounding area 112 when, for example, the absolute value of the difference [%] of the blue component from the surrounding area 112 is 40% or greater.
  • subject 2 has photosensitivity, subject 2's sensitivity to blue light is high, and therefore subject 2 will be able to recognize the test area 111 within the surrounding area 112 even if the absolute value of the difference [%] of the blue component from the surrounding area 112 is less than 30%.
  • subject 2 has photosensitivity, which causes high sensitivity to blue light, the high luminance of the peripheral region 112 and the test region 111 will cause the subject 2 to feel dazzled by the sensitivity test image 110B. Therefore, for subject 2 with photosensitivity, when the "luminance [%] of the peripheral region" is lower than 100%, it is easier to recognize the color difference between the peripheral region 112 and the test region 111, and it is easier to recognize the shape of the test region 111.
  • the luminance [%] of the peripheral region 112 is reduced, it may become difficult for the subject 2 to recognize the test region 111 within the peripheral region 112 if the absolute value of the difference [%] of the blue component from the peripheral region 112 is less than 30%.
  • the absolute value of the difference [%] of the blue component from the peripheral region 112 must be changed to 30% or more.
  • the conditions for recognizing the color difference between the peripheral region 112 and the inspection region 111 (in other words, the conditions for recognizing the inspection region 111 within the peripheral region 112) and the conditions for recognizing the shape of the inspection region 111 vary depending on the color vision characteristics of the subject 2. Therefore, by using multiple sensitivity inspection images 110B in which the brightness of the sensitivity inspection images 110B (the brightness of the peripheral region 112 and the inspection region 111) and the color difference of the inspection region 111 relative to the peripheral region 112 are different, it is possible to determine the color vision characteristics of the subject 2 to blue light.
  • Table 1 shows examples of sensitivity inspection images 110B in which the difference [%] of the blue component of the inspection region 111 from the peripheral region 112 ranges from -60% to +60%, but sensitivity inspection images 110B are not limited to these.
  • a sensitivity inspection image 110B may be prepared in which the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is less than -60%, or a sensitivity inspection image 110B in which the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is greater than +60%.
  • Tables 2 and 3 respectively show the input values (xRBG, xGBG, xBGB) of the surrounding area 112 and the input values ( xR , xG , xB ) of the inspection area 111 in a sensitivity inspection image 110R when the red component of the inspection area 111 is different from that of the surrounding area 112, and in a sensitivity inspection image 110G when the green component of the inspection area 111 is different.
  • the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is a positive value (+10% to +60)
  • the magnitude of the red component is greater than the green and blue components, and therefore the inspection area 111 has a reddish color.
  • the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is a negative value (-10% to -60)
  • the green and blue components are greater than the red component, and therefore the color of the inspection area 111 is cyan (a color with strong greenish and blueish hues).
  • the difference [%] of the green component of the inspection area 111 from the surrounding area 112 is a positive value (+10% to +60%), the magnitude of the green component is greater than the red and blue components, and therefore the inspection area 111 has a greenish color.
  • the difference [%] of the green component of the inspection area 111 from the surrounding area 112 is a negative value (-10% to -60)
  • the red and blue components are greater than the green component, and therefore the color of the inspection area 111 is magenta (a color with strong reddish and blueish hues).
  • magenta a color with strong reddish and blueish hues.
  • sensitivity test image 110B in sensitivity test images 110R and 110G, a subject 2 with normal color vision can easily recognize the color difference between the test area 111 and the surrounding area 112, even when the absolute values of the difference [%] of the red component of the test area 111 from the surrounding area 112 and the difference [%] of the green component from the surrounding area 112 are small (i.e., when the colors of the test area 111 and the surrounding area 112 are similar).
  • a subject 2 with low sensitivity to red or green light cannot recognize the inspection area 111 even if the absolute value of the difference [%] of the red component of the inspection area 111 from the surrounding area 112 or the difference [%] of the green component of the inspection area 111 from the surrounding area 112 is 30%, but can recognize the inspection area 111 when the absolute value of the difference [%] of the red component of the inspection area 111 from the surrounding area 112 or the difference [%] of the green component of the inspection area 111 from the surrounding area 112 is 50% or more.
  • subject 2 has photosensitivity, which causes them to be highly sensitive to blue light, a high luminance of the peripheral region 112 and the test region 111 will cause them to feel dazzled by the sensitivity test image 110B, making it difficult for them to recognize the test region 111. Therefore, for subject 2 with photosensitivity, when the "luminance [%] of the peripheral region" is lower than 100%, it is easier for them to recognize the color difference between the peripheral region 112 and the test region 111, and the shape of the test region 111.
  • the conditions for recognizing the color difference between the peripheral region 112 and the inspection region 111 differ depending on the color vision characteristics of the subject 2. Therefore, by using multiple sensitivity inspection images 110R, 110G that differ in brightness (brightness of the peripheral region 112 and the inspection region 111) and the color difference of the inspection region 111 relative to the peripheral region 112, it is possible to determine the color vision characteristics of the subject 2 for red and green light.
  • Table 2 shows an example of a sensitivity inspection image 110R in which the difference [%] of the red component of the inspection region 111 from the peripheral region 112 ranges from -60% to +60%, but the sensitivity inspection image 110R is not limited to these.
  • a sensitivity inspection image 110R may be prepared in which the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is less than -60%, or a sensitivity inspection image 110R in which the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is greater than +60%.
  • Table 3 also shows examples of sensitivity inspection images 110G in which the difference [%] of the green component of the inspection area 111 from the surrounding area 112 ranges from -60% to +60%, but the sensitivity inspection images 110G are not limited to these.
  • a sensitivity inspection image 110G in which the difference [%] of the green component of the inspection area 111 from the surrounding area 112 is less than -60%, or a sensitivity inspection image 110G in which the difference [%] of the green component of the inspection area 111 from the surrounding area 112 is greater than +60% may be prepared.
  • a vision test image set is a set of a plurality of vision test images 120 displayed on the display device 10.
  • Fig. 5 shows an example of the vision test image 120.
  • the vision test image 120 has a visual target 121 and a background area 122 surrounding the visual target 121.
  • the visual target 121 and the background area 122 have different colors.
  • the visual target 121 is used to test the visual acuity of the subject 2.
  • the visual acuity of the subject 2 is tested by checking whether the subject 2 can recognize the existence and shape of the visual target 121.
  • the visual target 121 is a Landolt ring, which is commonly used in vision tests.
  • the visual acuity test image set includes multiple visual acuity test images 120 with different sizes of Landolt rings and different breaks in the Landolt rings. Note that in the example shown in Figure 5, one visual acuity test image 120 has one optotype 121 arranged therein, but the present invention is not limited to this configuration. Multiple optotypes 121 may also be arranged in one visual acuity test image 120.
  • FIG. 6 shows a flowchart of the visual inspection method using the sensitivity inspection image 110 and the visual acuity inspection image 120.
  • an appropriate brightness B CENTER is identified, which is the brightness [%] of the peripheral region 112 of the sensitivity test image 110 that is appropriate for the subject 2.
  • the sensitivity test image 110B is displayed on the display unit 10, and it is examined whether the subject 2 feels dazzled by the sensitivity test image 110B and whether he or she can recognize the test region 111. Note that the phoropter 20 does not have to be used at this time.
  • sensitivity test images 110B in which the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is -30% are sequentially displayed on the display device 10 while the brightness [%] of the surrounding area 112 is changed.
  • the displayed sensitivity test images 110B may be displayed in ascending or descending order of the brightness [%] of the surrounding area 112.
  • the sensitivity test images 110B may be displayed in descending order of the brightness [%] of the surrounding area 112, and then in descending order of the brightness [%] of the surrounding area 112.
  • the brightness [%] of the surrounding area 112 may be changed randomly.
  • the color component of the inspection area 111 also changes accordingly, while the blue component of the inspection area 111 relative to the blue component of the surrounding area 112 remains at -30%.
  • the time for which one sensitivity test image 110B is displayed is, for example, the time during which the subject 2 can confirm whether or not the sensitivity test image 110B is dazzling and whether or not they can recognize the test area 111, and then provide a response with the results of that confirmation. For example, after one sensitivity test image 110B is displayed for one second or more, the next sensitivity test image 110B with a different brightness [%] of the surrounding area 112 is displayed.
  • subject 2 has normal visual characteristics for blue light, subject 2 is likely to be able to recognize the test area 111 within the peripheral area 112, regardless of the brightness [%] of the peripheral area 112. If subject 2 has photosensitivity, he or she will feel dazzled by the sensitivity test image 110B if the brightness [%] of the peripheral area 112 is high. Therefore, subject 2 with photosensitivity will have difficulty recognizing the test area 111 in a sensitivity test image 110B where the brightness [%] of the peripheral area 112 is relatively high, and will be able to recognize the test area 111 in a sensitivity test image 110B where the brightness [%] of the peripheral area 112 is relatively low.
  • subject 2 has low visual sensitivity for blue light, he or she will have difficulty recognizing changes in the blue component of the test area 111, and may be unable to recognize the test area 111 in a sensitivity test image 110B where the difference [%] of the blue component of the test area 111 from the peripheral area 112 is -30%. Therefore, by testing whether subject 2 can recognize test area 111 within peripheral area 112, it is possible to test subject 2's sensitivity to blue light, or the difference between subject 2's sensitivity to blue light and that of a healthy individual.
  • test area 111 in sensitivity test image 110B where the difference [%] of the blue component of test area 111 from the surrounding area 112 is -30% this means that subject 2's sensitivity to blue light is at least as high as that of a healthy subject.
  • subject 2 cannot recognize test area 111 in sensitivity test image 110B where the difference [%] of the blue component of test area 111 from the surrounding area 112 is -30% this means that subject 2's sensitivity to blue light is lower than that of a healthy subject.
  • subject 2 who has photosensitivity, has high sensitivity to blue light
  • the subject 2 identifies the luminance [%] of the peripheral region 112 at which the test area 111 can be recognized while viewing the sensitivity test image 110B in which the luminance [%] of the peripheral region 112 changes.
  • the subject 2 then identifies the median (or a value close to the median) of the range of luminance [%] of the peripheral region 112 at which the test area 111 can be recognized as the appropriate luminance B CENTER .
  • the appropriate luminance B CENTER may be the highest luminance value within the range of luminance [%] of the peripheral region 112 at which the test area 111 can be recognized. If the subject 2 can recognize the test area 111 regardless of the luminance [%] of the peripheral region 112, 100% may be set as the appropriate luminance B CENTER .
  • the ability of the subject 2 to recognize the test area 111 without feeling any glare from the sensitivity test image 110B is an example of a first test condition.
  • sensitivity inspection image 110B where the difference [%] of the blue component of inspection area 111 from the surrounding area 112 is -30%
  • sensitivity inspection image 110B where the difference [%] of the blue component of inspection area 111 from the surrounding area 112 is -40%
  • subject 2 is tested to see if he or she can recognize the inspection area 111 within the surrounding area 112 of the displayed sensitivity inspection image 110B.
  • the brightness [%] of the surrounding area 112 of the displayed sensitivity inspection image 110B may be changed sequentially.
  • sensitivity inspection image 110B is displayed with the difference [%] of the blue component of inspection area 111 from the surrounding area 112 set even lower. In this way, the difference [%] of the blue component of the test area 111 from the surrounding area 112 is changed until the test subject 2 can recognize the test area 111. This makes it possible to test the extent to which the test subject 2's sensitivity to blue light is lower than that of a healthy individual.
  • a sensitivity test image 110B in which the difference [%] of the blue component of the test area 111 from the surrounding area 112 is -30% may be displayed to test whether the test subject 2 can recognize the test area 111.
  • a sensitivity inspection image 110B is initially displayed in which the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is -30%, and the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is changed to a lower value depending on the inspection results.
  • embodiments of the present invention are not limited to this process.
  • a sensitivity inspection image 110B in which the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 is +30% may be initially displayed, and the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 of the displayed sensitivity inspection image 110B may be changed to a higher value depending on the inspection results.
  • the sensitivity inspection image 110B may initially be displayed with a small absolute value of the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 (for example, -10% or +10%), and the absolute value of the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 of the displayed sensitivity inspection image 110B may be changed to a larger value depending on the inspection results.
  • the sensitivity inspection image 110B may initially be displayed with a large absolute value (e.g., -60% or +60%) of the difference [%] of the blue component of the inspection area 111 from the surrounding area 112, and then, depending on the inspection results, the absolute value of the difference [%] of the blue component of the inspection area 111 from the surrounding area 112 of the displayed sensitivity inspection image 110B may be changed to a smaller value.
  • a large absolute value e.g., -60% or +60%
  • a specific red component R VALUE is measured, which is a red component with which the subject 2 can recognize the inspection area 111 within the peripheral area 112 of the sensitivity inspection image 110R.
  • a difference [%] in the red component with which the subject 2 can recognize the inspection area 111 within the peripheral area 112 from the peripheral area 112 is specified.
  • Being able to recognize the inspection area 111 within the peripheral area 112 specifically means being able to recognize the difference in color between the inspection area 111 and the peripheral area 112 and being able to distinguish the inspection area 111 within the peripheral area 112.
  • the phoropter 20 does not need to be used in S102.
  • the subject 2's ability to recognize the inspection area 111 is an example of a second inspection condition.
  • the sensitivity inspection image 110R is sequentially displayed on the display device 10 while changing the difference [%] of the red component of the inspection area 111 from the surrounding area 112 from ⁇ 10% to ⁇ 60%.
  • the brightness [%] of the surrounding area 112 of the sensitivity inspection image 110R is set to the appropriate brightness B CENTER specified in S101.
  • the size of the red component of the test area 111 is 10% smaller than the size of the green component.
  • the red component of the test area 111 becomes smaller (as the difference [%] of the red component from the surrounding area 112 approaches -60%), the difference between the red and green components of the test area 111 increases, and the color difference between the test area 111 and the surrounding area 112 also increases.
  • test subject 2 has normal visual characteristics for red and green light, the test subject 2 is likely to be able to recognize the test area 111 within the surrounding area 112 in a sensitivity test image 110R in which the difference [%] of the red component of the test area 111 from the surrounding area 112 is -30% or less.
  • subject 2 has a relatively low sensitivity to red light, he or she may not be able to recognize test area 111 in sensitivity test image 110R, in which the difference [%] of the red component of test area 111 from surrounding area 112 is -30%.
  • test area 111 of sensitivity test image 110R where the difference [%] of the red component of test area 111 from the surrounding area 112 is -30%, this means that subject 2's sensitivity to red light is at least as high as that of a healthy subject.
  • subject 2 cannot recognize test area 111 of sensitivity test image 110R where the light color component of test area 111 is -30%, this means that subject 2's sensitivity to red light is lower than that of a healthy subject.
  • the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is -30%
  • the difference [%] of the red component of the inspection area 111 of the sensitivity inspection image 110R from the surrounding area 112 is changed to -40% and displayed. Then, a test is performed to see if the subject 2 can recognize the inspection area 111 within the surrounding area 112 of the displayed sensitivity inspection image 110R. At this time, the brightness [%] of the surrounding area 112 of the displayed sensitivity inspection image 110R may be changed sequentially.
  • the sensitivity inspection image 110R is displayed with the red component of the inspection area 111 set even lower.
  • the sensitivity test images 110R are sequentially displayed on the display device 10 while the difference [%] of the red component of the test area 111 from the surrounding area 112 is changed from -10% to -60%, and the difference [%] of the red component from the surrounding area 112 with the smallest absolute value is identified among the differences [%] of the red component at which the test area 111 can be recognized by the test subject 2.
  • a sensitivity inspection image 110R in which the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is -10% is initially displayed, and the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is changed to a lower value depending on the inspection results.
  • embodiments of the present invention are not limited to this process.
  • a sensitivity inspection image 110R in which the difference [%] of the red component of the inspection area 111 from the surrounding area 112 is +10% may be initially displayed, and the difference [%] of the red component of the inspection area 111 from the surrounding area 112 of the displayed sensitivity inspection image 110R may be changed to a higher value depending on the inspection results.
  • the sensitivity inspection image 110R may be initially displayed with a large absolute value of the red component of the inspection area 111 (for example, -60% or +60%), and the absolute value of the difference [%] of the red component of the inspection area 111 from the surrounding area 112 of the displayed sensitivity inspection image 110R may be changed to a lower value depending on the inspection results.
  • a specific green component G VALUE is measured, which is a green component with which the subject 2 can recognize the inspection area 111 in the peripheral area 112 of the sensitivity inspection image 110G.
  • the sensitivity inspection image 110G is sequentially displayed on the display device 10 while changing the difference [%] of the green component of the inspection area 111 from the peripheral area 112 from -10% to -60%.
  • the brightness [%] of the peripheral area 112 of the sensitivity inspection image 110R is set to the appropriate brightness B CENTER specified in S101.
  • the subject 2 is tested to see if he or she can recognize the test area 111 within the peripheral area 112 of the sensitivity test image 110G. Specifically, the subject 2 is tested to see if he or she can recognize the difference in color between the test area 111 and the peripheral area 112, and if he or she can identify the shape of the test area 111. Note that the phoropter 20 does not have to be used in S103.
  • the test method in S103 is the same as the test in S102, except that sensitivity test image 110G is used instead of sensitivity test image 110R, and the difference [%] of the green component from the surrounding area 112 is changed instead of the difference [%] of the red component of test area 111 from the surrounding area 112.
  • sensitivity test images 110G are sequentially displayed on display device 10 while the difference [%] of the green component of test area 111 from the surrounding area 112 is changed from -10% to -60%, and the difference [%] of the green component from the surrounding area 112 with the smallest absolute value is identified among the differences [%] of the green component from the surrounding area 112 at which subject 2 can recognize test area 111.
  • This test can test subject 2's sensitivity to green light, or the difference between subject 2's sensitivity to green light and that of a healthy individual. In other words, it is possible to examine the sensitivity of subject 2's M cone cells, or the difference between the sensitivity of subject 2's M cone cells and the sensitivity of M cone cells in a healthy individual.
  • both the sensitivity of subject 2 to red light and the sensitivity of subject 2 to green light are tested in S102 and S103, but the processing of this embodiment is not limited to this.
  • a test either S102 or S103
  • the test in S102 may be performed and the test in S103 may be omitted.
  • the test in S103 may be performed and the test in S102 may be omitted.
  • sensitivity test image 110B when only testing the degree of photosensitivity of subject 2, only S101 may be performed.
  • the degree of photosensitivity is tested by determining at what luminance [%] of the peripheral area 112 subject 2 feels dazzled. Therefore, when testing the degree of photosensitivity, it is not necessary to use sensitivity test image 110B; sensitivity test image 110R or sensitivity test image 110G may also be used.
  • step S104 in FIG. 6 the difference between the sensitivity to red light and the sensitivity to green light of the subject 2 is calculated using the specific red component R VALUE and the specific green component G VALUE identified in S102 and S103. In this embodiment, the ratio of the sensitivity to red light to the sensitivity to green light is calculated.
  • the sensitivity ratio is calculated as
  • the sensitivity ratio is calculated as
  • step S105 in FIG. 6 the visual acuity of the subject 2 is measured using the phoropter 20 and the visual acuity test image 120.
  • the brightness [%] of the background region 122 of the vision test image 120 is set to the appropriate brightness B CENTER identified in S101 so that the subject 2 does not feel dazzled by the vision test image 120.
  • the color of the optotype 121 in the vision test image 120 is set so that the subject 2 can easily recognize the difference in color from the background region 122.
  • the color of the optotype 121 is, for example, black. This increases the color difference between the background region 122 and the optotype 121, making it easier to measure the visual acuity of the subject 2. Furthermore, by making the optotype 121 black, if the subject 2 has photosensitivity, the subject 2 is less likely to be dazzled by the optotype 121, allowing for accurate measurement of visual acuity.
  • the color of the vision test image 120 may be adjusted based on the ratio of sensitivity to red light to sensitivity to green light calculated in S104.
  • the colors of the background region 122 and the optotype 121 of the visual acuity test image 120 may be set to correct this sensitivity ratio.
  • the green components of the background region 122 and the optotype 121 may be set to be lower by
  • the red components of the background region 122 and the optotype 121 may be set to be higher by
  • both the red and green components of the background region 122 and the optotype 121 may be adjusted to correct the sensitivity ratio.
  • the colors of the background region 122 and the optotype 121 of the visual acuity test image 120 may be set to correct this sensitivity ratio.
  • the red components of the background region 122 and the optotype 121 may be set to be lower by
  • the green components of the background region 122 and the optotype 121 may be set to be higher by
  • both the red and green components of the background region 122 and the optotype 121 may be adjusted to correct the sensitivity ratio.
  • the subject 2 views the vision test image 120 through the trial lens 21 attached to the phoropter 20.
  • the subject 2 is then tested to see if he or she can recognize the presence and shape of the optotype 121.
  • the visual acuity of the subject 2 can be tested by changing the type of trial lens 21 (power, direction of astigmatism axis, etc.) and the size of the optotype 121 when the subject 2 can recognize the presence and shape of the optotype 121.
  • the size of the optotype 121 is not limited, and the optotype 121 may be set large according to the subject 2's eyesight, or the distance between the subject 2 and the display device 10 may be narrowed.
  • the brightness is adjusted so that the subject 2 does not perceive the visual acuity test image 120 as too dazzling.
  • the color of the visual acuity test image 120 is adjusted according to the color vision characteristics of the subject 2. This prevents the subject 2 from having difficulty recognizing the optotype 121 due to their photosensitivity or color vision characteristics, which could result in an inaccurate measurement of their visual acuity.
  • correction filter When the visual characteristics of the subject 2 are tested by the visual testing method shown in Fig. 6, the test results are used to create a correction filter that corrects the visual characteristics of the subject 2.
  • the correction filter corrects the visual acuity of the subject 2 and also corrects the photosensitivity and color vision characteristics of the subject 2.
  • the material of the correction filter and the principle by which the transmission spectrum is changed are not particularly limited.
  • the correction filter is worn by the subject 2, for example, like glasses.
  • the shape of the correction filter is not particularly limited.
  • the correction filter may be in the shape of a contact lens.
  • the correction filter 300 includes a lens that corrects the vision of the subject 2, and a filter provided on the surface of the lens that changes the spectrum of light that passes through.
  • the shape of the lens corresponds to the results of the vision measurement in S105, and is configured to correct the vision of the subject 2.
  • the filters include, for example, a filter 300B for light in the blue region, a filter 300G for light in the green region, and a filter 300R for light in the red region.
  • Each of the filters 300B, 300G, and 300R has a band width B B , B G , and B R that change the light transmittance, respectively.
  • Filter 300B changes the transmittance of light in the blue region (in other words, it absorbs or reflects part of the blue light), but transmits green and red light unchanged (in other words, it has low absorptance and reflectance for green and red light).
  • Filter 300G changes the transmittance of light in the green region (in other words, it absorbs or reflects part of the green light), but transmits blue and red light unchanged (in other words, it has low absorptance and reflectance for blue and red light).
  • Filter 300R changes the transmittance of light in the red region (in other words, it absorbs or reflects part of the red light), but transmits green and blue light unchanged (in other words, it has low absorptance and reflectance for green and blue light). Therefore, by combining the three filters 300B, 300G, and 300R, it is possible to individually adjust the transmittance for light in the three RGB wavelength bands.
  • Figures 8(a) to 8(c) show the bands B B , B G , and B R over which the light transmittance of three filters 300B, 300G, and 300R can be changed, respectively.
  • the horizontal axis of Figures 8(a) to 8(c) represents the wavelength of light, and the vertical axis represents the normalized transmittance of each filter.
  • Figures 8(a) to 8(c) show the absorption spectra of each cone cell and rod cell superimposed, with the vertical axis representing the normalized absorption of each cell.
  • the peak wavelength P S of sensitivity of S cone cells is approximately 420 nm
  • the peak wavelength P M of sensitivity of M cone cells is approximately 534 nm
  • the peak wavelength P L of sensitivity of L cone cells is approximately 564 nm
  • the peak wavelength P Rod of sensitivity of rod cells is approximately 498 nm
  • the wavelength P Pho at which photopic vision is at its maximum sensitivity is approximately 570 nm (see Figure 3).
  • the filter 300B can change the transmittance of light with wavelengths equal to or greater than the peak wavelength Ps (approximately 420 nm) of sensitivity of S cone cells and equal to or less than the peak wavelength P Rod (approximately 498 nm) of sensitivity of rod cells.
  • the lower limit of the band B B of the filter 300B is P S and the upper limit is the wavelength P Rod .
  • the lower limit of the band B B of the filter 300B is not limited to P S.
  • the lower limit of the band B B may be set to a wavelength band shorter than P S.
  • filter 300B only needs to be able to change the transmittance of light in the blue wavelength band, and the upper limit of the bandwidth B 1 B of filter 300B is not limited to the peak wavelength P Rod (approximately 498 nm) of rod cells.
  • Figure 8(a) shows another example of the upper limit of the bandwidth B 1 B of filter 300B, and the bandwidth B 1 B in that case, indicated by dotted arrows.
  • the upper limit of the band B of the filter 300B may be a wavelength X Rod-M (approximately 515 nm) at which the absorption spectrum of rod cells intersects with the absorption spectrum of M cone cells.
  • This wavelength X Rod-M is longer than the peak wavelength P Rod and shorter than the peak wavelength P M (approximately 534 nm) of M cone cells.
  • the sensitivity of rod cells is relatively low and the sensitivity of M cone cells is relatively high.
  • the transmittance of light absorbed by M cone cells will be changed, which may make it impossible to properly correct the visual characteristics of the subject 2.
  • the upper limit of the band B of the filter 300B may be shorter than the peak wavelength P Rod (approximately 498 nm) of sensitivity of rod cells.
  • the upper limit of the band B of the filter 300B may be the wavelength X S-Rod (approximately 453 nm) at which the absorption spectrum of S cone cells intersects with the absorption spectrum of rod cells. This wavelength X S-Rod is longer than the peak wavelength P S and shorter than the peak wavelength P Rod .
  • the sensitivity of rod cells is relatively low and the sensitivity of S cone cells is relatively high. Therefore, if the upper limit of the band B of the filter 300B is set shorter than the wavelength X S-Rod , the proportion of light absorbed by S cone cells will be large, which may result in inadequate correction of photosensitivity.
  • the band width B 1 B of filter 300B includes a wavelength band close to the peak sensitivity wavelength P Rod of rod cells. Therefore, the upper limit of the band width B 1 B of filter 300B may be shorter than the peak sensitivity wavelength P Rod of rod cells, but it is preferable that it is not too far from the peak wavelength P Rod . For example, if the difference between the peak sensitivity wavelength P Rod of rod cells and the wavelength X Rod-M at which the absorption spectrum of rod cells intersects with the absorption spectrum of M cone cells is ⁇ , the effect of rod cells on photosensitivity can be appropriately corrected by setting the upper limit of the band width B 1 B of filter 300B within the range of P Rod ⁇ .
  • filter 300G changes the transmittance of light with wavelengths equal to or greater than the peak sensitivity wavelength P Rod (approximately 498 nm) of rod cells and equal to or less than wavelength X ML (approximately 548 nm) at which the absorption spectrum of M cone cells intersects with the absorption spectrum of L cone cells.
  • This wavelength X ML is longer than peak wavelength P M and shorter than peak wavelength P L (approximately 564 nm).
  • the lower limit of the bandwidth BG of filter 300G is wavelength P Rod and the upper limit is wavelength X ML .
  • the lower limit of the bandwidth BG of filter 300G may be set to wavelength X Rod-M (approximately 515 nm) at which the absorption spectrum of rod cells intersects with the absorption spectrum of M cone cells.
  • the bandwidth BG of filter 300G is shown by the dotted line in Figure 8(b).
  • Rod cells are cells that respond to the intensity of light and do not affect the subject's color perception (color vision). Therefore, even if the lower limit of the bandwidth BG of filter 300G is set to the peak sensitivity wavelength P Rod of rod cells, green light can be corrected.
  • Filter 300R is a filter that changes the transmittance of red light through subject 2, and has the property of absorbing or reflecting light in the wavelength band to which L cone cells are sensitive.
  • filter 300R transmits only light with wavelengths equal to or greater than X ML (approximately 548 nm), which is the wavelength at which the absorption spectrum of M cone cells intersects with the absorption spectrum of L cone cells.
  • X ML approximately 548 nm
  • the lower limit of the bandwidth BR of filter 300R is wavelength X ML .
  • the sensitivity of the L cone cells is low and the sensitivity of the M cone cells is dominant. Therefore, if the lower limit of the band B R of the filter 300R is set shorter than the wavelength X ML , not only red light but also green light may be absorbed or reflected by the L cone cells.
  • the lower limit of the band width BR of the filter 300R may be set to the wavelength P Pho (approximately 570 nm) at which photopic vision has maximum sensitivity, rather than the wavelength X ML .
  • the transmittance of the band B 1 B of the filter 300B is set based on the appropriate brightness B CENTER identified in S101. For example, if the appropriate brightness B CENTER is 70%, the transmittance of the band B 1 B is set to 70%. This corrects the photosensitivity of the subject 2.
  • the transmittance of the bands B- G of the filter 300G and the transmittance of the bands B- R of the filter 300R are set based on the test results of S102 and S103. For example, if the specific red component R VALUE is determined to be ⁇ 30% in the test of S102, the subject 2's sensitivity to red light is approximately the same as that of a healthy subject. Furthermore, if the specific green component G VALUE is determined to be ⁇ 50% in the test of S103, the subject 2's sensitivity to green light is lower than that of a healthy subject.
  • the transmittance of the bands B- R of the filter 300R is set to be
  • FIG. 9 shows an example of the characteristics of the correction filter 300 in the above example.
  • the horizontal axis of FIG. 9 represents wavelength [nm], and the vertical axis represents transmittance [%] of the correction filter 300.
  • the transmittance of the band B of filter 300B is set to 70%
  • the transmittance of the band B of filter 300G is set to 100%
  • the transmittance of the band B of filter 300R is set to
  • R /G times lower than the transmittance of the band B of filter 300G (i.e., 30/50 60%).
  • the correction filter 300 has characteristics that combine the characteristics of the three filters 300R, 300G, and 300B. Use of this correction filter 300 can reduce the glare felt by the subject 2 and can correct the difference in sensitivity between the subject 2 to red light and the subject 2 to green light.
  • the transmittance in the region of wavelengths shorter than band B B is approximately 0%. This is to reduce the glare felt by subject 2 who has photosensitivity. However, because subject 2's photosensitivity is corrected by lowering the transmittance in band B B of the compensation filter 300, the transmittance in the region of wavelengths shorter than band B B does not have to be 0% and may be, for example, the same as the transmittance of band B B. Also, in the example shown in FIG. 9 , in band B R , all wavelengths equal to or greater than wavelength X ML (approximately 548 nm) are set to 60%.
  • the transmittance of compensation filter 300 for light with wavelengths longer than approximately 650 nm may be set to any value.
  • the transmittance of the band B_G of the filter 300G and the transmittance of the band B_R of the filter 300R may be based on the transmittance of the band B_B of the filter 300B. For example, if the appropriate brightness B_CENTER is 70%, the transmittance of the band B_B is set to 70%. Furthermore, if the specific red component R_VALUE is specified as -30% and the specific green component G_VALUE is specified as -50%, the transmittance of the band B_R of the filter 300R is set to
  • times the transmittance of the band B_B , 70%, (70% x 60% 42%). Furthermore, the transmittance of the band B_G of the filter 300G is set to 70%, the same as the transmittance of the band B_B .
  • FIG. 10 shows an example of the characteristics of the compensation filter 300 in the above example.
  • the horizontal axis of FIG. 10 represents wavelength [nm], and the vertical axis represents transmittance [%] of the compensation filter 300.
  • the transmittance of the band B- B of filter 300B and the transmittance of the band B- G of filter 300G are set to 70%, and the transmittance of the band B- R of filter 300R is set to 42% (70% x 60%).
  • the subject 2 can recognize the test area 111 within the peripheral area 112 of the sensitivity test image 110B, where the difference [%] of the blue component of the test area 111 from the peripheral area 112 is -40%, the sensitivity of the subject 2 to blue light is 75% (30/40) of the sensitivity of a healthy person to blue light.
  • the subject 2 in the test in S102, if the subject 2 can recognize the test area 111 within the peripheral area 112 of the sensitivity test image 110R, where the difference [%] of the red component of the test area 111 from the peripheral area 112 is -30%, the subject 2's sensitivity to red light is comparable to that of a healthy subject.
  • the subject 2 can recognize the test area 111 within the peripheral area 112 of the sensitivity test image 110G, where the difference [%] of the green component of the test area 111 from the peripheral area 112 is -50%, the subject 2's sensitivity to green light is 60% (30/50) of that of a healthy subject. In this way, by testing the extent to which the subject 2's sensitivity to each color of RGB light differs from that of a healthy subject, the ratio of the subject 2's sensitivity to RGB light can be determined.
  • the transmittance of the band B- B of the filter 300B is set to 75% of the transmittance of the band B- G of the filter 300G
  • the transmittance of the band B -R of the filter 300R is set to 60% of the transmittance of the band B- G of the filter 300G.
  • FIG. 11 shows an example of the characteristics of the correction filter 300 in the above example.
  • the horizontal axis of FIG. 11 represents wavelength [nm], and the vertical axis represents transmittance [%] of the correction filter 300.
  • the subject 2 has the lowest sensitivity to green light, so the transmittance of the bands B and G of the filter 300G is set to 100%.
  • the transmittance of the bands B and B of the filter 300B is set to 75% of the transmittance of the bands B and G of the filter 300G, and the transmittance of the bands B and R of the filter 300R is set to 60% of the transmittance of the bands B and G of the filter 300G.
  • This correction filter 300 has a relatively high transmittance for green light, to which the subject 2 has low sensitivity, and a relatively low transmittance for red light, to which the subject 2 has high sensitivity (i.e., similar to that of a healthy person). This makes it possible to correct for differences in the subject 2's sensitivity to RGB light.
  • the method for determining the characteristics of the correction filter 300 using the results of the visual test shown in Figure 6 is not limited to the above example.
  • the characteristics of the correction filter 300 may be determined using only one or two of them.
  • the characteristics of filters 300B, 300G, and 300R may be determined using each of the test results S101 to S103 individually.
  • correction filter 300 may be designed to match the visual characteristics of the subject 2.
  • color filters with various characteristics may be prepared in advance, and the correction filter 300 may be produced by combining multiple color filters to match the visual characteristics of the subject 2.
  • the sensitivity test image 110 has a peripheral region 112 and a test region 111 provided in the center of the peripheral region 112.
  • this sensitivity test image 110 it is possible to test the visual acuity of the subject 2 taking into account the sensitivity to luminance and color vision characteristics.
  • the brightness of the sensitivity test image 110 is measured so that the subject 2 does not feel dazzled, and the visual acuity of the subject 2 is tested using the visual acuity test image 120 whose brightness has been adjusted based on this measurement result. This prevents the subject 2 from feeling dazzled and being unable to focus on the optotype 121, which would result in an inability to accurately measure their visual acuity.
  • the color vision characteristics of the subject i.e., the difference between sensitivity to red light and sensitivity to green light
  • the brightness of the sensitivity test image 110 adjusted so that the subject 2 does not perceive the sensitivity test image 110 as dazzling. This prevents the subject 2 from being able to focus on the test area 111 due to perceiving it as dazzling, which makes it possible to prevent the color vision characteristics of the subject 2 from being unable to be measured accurately.
  • the visual acuity of the subject 2 is tested with the difference between the subject 2's sensitivity to red light and that to green light adjusted. This prevents the subject 2 from having difficulty recognizing the color of the optotype 121 in the visual acuity test image 120, allowing for accurate measurement of visual acuity.
  • the colors of the peripheral region 112 and the test region 111 of the sensitivity test image 110 have the same magnitude for any two of the RGB components. Therefore, when testing the subject 2's visual characteristics in response to the remaining component of light, it is possible to prevent the difference in the subject 2's sensitivity to the other two components of light from affecting the test.
  • the sensitivity test image set includes multiple sensitivity test images 110 in which the surrounding areas 112 have the same color and the test areas 111 have different colors. Therefore, when visual characteristics are tested using the colors of the sensitivity test images 110, the color of the surrounding areas 112 can be prevented from affecting the visual characteristics test results.
  • the sensitivity test image set includes multiple sensitivity test images 110 in which the color or brightness of the peripheral region 112 differs from one another. Therefore, by changing the color or brightness of the peripheral region 112 of the sensitivity test image 110, the degree of photosensitivity of the subject 2 can be tested.
  • sensitivity test image 110B when testing the subject 2's sensitivity to blue light, sensitivity test image 110B is used, when testing the subject 2's sensitivity to green light, sensitivity test image 110G is used, and when testing the subject 2's sensitivity to red light, sensitivity test image 110R is used. Therefore, it is possible to test only the specific color of the three RGB colors that you want to test.
  • test images such as the sensitivity test image 110 and the visual acuity test image 120 are displayed on the display device 10, and in the above-described processing steps S101 to S105, the brightness and color of the test image can be changed by changing the image signal input to the display device 10, but the embodiments of the present invention are not limited to this configuration.
  • the brightness and color of the test image may be changed by inserting a filter that changes the spectrum of the transmitted light or a filter that changes the intensity of the transmitted light between the subject 2 and the test image.
  • a filter that changes the spectrum of the transmitted light or a filter that changes the intensity of the transmitted light between the subject 2 and the test image.
  • multiple color filters with different transmittances for each wavelength band, or gray filters that reduce the intensity of light in the visible light band are prepared. These filters are inserted into and removed from the phoropter 20, for example, along with the ophthalmic lens. By inserting one or more color filters or gray filters into the phoropter 20, the brightness and color of the test image seen by the subject 2 can be changed.
  • a color filter or gray filter between the test image and the trial lens 21, which corrects the vision of the subject 2. This is because if a color filter or gray filter is placed between the subject 2 and the trial lens 21, the distance from the subject-side surface of the trial lens 21 to the vertex of the subject's cornea (vertex distance) may change from the design value of the vertex distance of the trial lens 21, which could make it impossible to accurately measure the vision of the subject 2. It is also possible to place a color filter or gray filter between the subject 2 and the trial lens 21, and correct the vision taking into account the change in the vertex distance.
  • the sensitivity test image 110 displayed on the display device 10 is manually switched by the examiner operating the operation unit 40, but embodiments of the present invention are not limited to this configuration.
  • the displayed sensitivity test image 110 may be manually switched by the examiner or subject 2, or some or all of it may be automatically switched according to a preset program.
  • the visual acuity test image 120 displayed in the process of S105 may also be manually switched by the examiner or subject 2, or some or all of it may be automatically switched.
  • sensitivity test images 110B with different brightness levels in the peripheral area 112 are displayed while being switched sequentially, and the brightness level of the peripheral area 112 at which the subject 2 can recognize the test area 111 without feeling dazzled by the sensitivity test image 110B is identified.
  • the sensitivity test images 110 may be switched at regular time intervals.
  • the displayed sensitivity test image 110 may be switched in response to input into the operation unit 40 by the subject 2 as to whether or not he or she feels dazzled by the sensitivity test image 110 or whether or not he or she can recognize the test area 111.
  • Fig. 12 is a schematic diagram of a vision test system 1A in a modified embodiment of the present invention.
  • the test of the subject 2's sensitivity to brightness and color i.e., measurements S101 to S104
  • the visual acuity measurement of the subject 2 i.e., measurement S105
  • the visual inspection system 1A includes a display device 10, a control unit 30, and an operation unit 40.
  • the display device 10, the control unit 30, and the operation unit 40 are the same as those shown in Fig. 1.
  • a sensitivity inspection image 110 is displayed on the display device 10. Using this sensitivity inspection image 110, the processes of S101 to S104 of the visual inspection shown in Fig. 6 are executed, and the appropriate luminance B CENTER and the ratio of the subject's sensitivity to red light and sensitivity to green light are measured.
  • the visual testing system 1A also includes a phoropter 20 and an eye chart 130.
  • the phoropter 20 is the same as that shown in FIG. 1, and can be fitted with trial lenses 21.
  • FIG. 14 is a front view of the eye chart 130 as seen from the subject 2.
  • the eye chart 130 is commonly used for visual acuity tests, and has at least one black eye chart 131 arranged on a white background 132.
  • the eye chart 131 is, for example, a Landolt ring, a letter, or a figure, and the eye chart 130 has multiple eye charts 131 of different sizes and shapes arranged on it.
  • the eye chart 130 is an example of a visual acuity test image.
  • the visual acuity of subject 2 can be measured by testing whether subject 2 can recognize the presence and shape of each optotype 131 when looking directly at the eye chart 130 from a predetermined distance away. Also, by subject 2 looking at the eye chart 130 through a phoropter 20 fitted with trial lenses 21, the power and type of lens required to correct subject 2's visual acuity can be identified.
  • the vision testing system 1A includes a test filter 22, which is disposed between the trial lens 21 and the eye chart 130 and is capable of changing the intensity and spectrum of light transmitted through it.
  • the test filter 22 is attachable to the phoropter 20.
  • the characteristics of the test filter 22 are determined based on the appropriate luminance B CENTER measured in steps S101 to S104 using the sensitivity test image 110 and the ratio of the subject's sensitivity to red light to that to green light. For example, if the subject 2 has a higher sensitivity to blue light than a healthy individual, a test filter 22 with a low transmittance of blue light is used.
  • test filter 22 with an adjusted transmittance of one or both of red light and green light is used to correct this difference.
  • the characteristics of the test filter 22 are determined in a manner similar to the characteristics of the correction filter 300 described above for correcting photosensitivity and color vision characteristics.
  • the subject 2's sensitivity to light intensity and color is tested using the sensitivity test image 110, and this test result is used to correct the subject 2's sensitivity to light intensity and color using the test filter 22. This prevents the subject 2's sensitivity to light intensity and color from affecting the test of vision characteristics using the optometry filter 21, making it impossible to accurately test vision.
  • the background 132 is white and the optotype 131 is black, but the embodiment of the present invention is not limited to this configuration.
  • the vision chart 130 may be displayed on a display device that displays an image based on an image signal.
  • the vision chart 130 displayed on the display device may be able to change the brightness or color of the background 132 or the optotype 131 by changing the image signal. This configuration eliminates the need to insert or remove the test filter 22 used in the vision testing system 1A into or from the phoropter 20.
  • the visual acuity measurement of the subject 2 may be performed using a configuration of the visual inspection system 1A excluding the display device 10, the control unit 30, and the operation unit 40.
  • the visual inspection system 1A may be configured to include an eye chart 130 and a phoropter 20 to which the trial lens 21 and the test filter 22 can be attached.
  • the subject 2's sensitivity to luminance and color using the sensitivity test image 110 is not measured.
  • the test filter 22 attenuates the light that passes through so that the subject 2 does not perceive the eye chart 130 as dazzling.
  • the test filter 22 also changes the spectrum of the light that passes through so that the subject 2 can clearly recognize the difference in color between the background 132 and the eye chart 131.
  • the subject 2's visual acuity is measured by testing whether the subject 2 can recognize the presence and shape of the eye chart 131.
  • the test filter 22 changes the brightness and color of the eye chart 130 as seen by the subject 2, making it possible to set conditions that make it easier for the subject 2 to take the eye chart test. This eliminates the need to prepare a sensitivity test image 110, simplifying the configuration of the visual inspection system 1A.
  • Fig. 14 is a schematic diagram of a visual inspection system 1B according to a modified embodiment of the present invention.
  • This visual inspection system 1B includes a display device 10B, a control unit 30, an operation unit 40, and a phoropter 20.
  • the control unit 30, the operation unit 40, and the phoropter 20 are the same as those shown in Fig. 1.
  • An eye chart 130B is displayed on the display device 10B.
  • the eye chart 130B is used to test the visual acuity of the subject 2.
  • the eye chart 130B displayed on the display device 10B has a background 132B and at least one optotype 131B, similar to the eye chart 130 shown in FIG. 13. Unlike the visual inspection system 1A shown in FIG. 12, in the visual inspection system 1B, the brightness and color of the background 132B and optotype 131B can be adjusted by changing the image signal output from the control unit 30.
  • the brightness of the background 132B and the optotype 131B is changed so that the subject 2 does not feel dazzled by the eye chart 130B.
  • the color of at least one of the background 132B and the optotype 131B is also changed so that the subject 2 can clearly recognize the difference in color between the background 132B and the optotype 131B.
  • the visual acuity of the subject 2 is measured by testing whether the subject 2 can recognize the presence and shape of the optotype 131B.
  • FIG. 15 is a schematic diagram of a visual inspection system 1C according to a modified embodiment of the present invention.
  • the visual inspection system 1C shown in FIG. 15 is the same as the visual inspection system 1 shown in FIG. 1, except that the control unit 30 includes a communication interface 34 and is connected to the server 50 via the communication interface 34.
  • the communication interface 34 may be configured for either wired or wireless communication.
  • the control unit 30 and the server 50 are connected via a network.
  • the server 50 stores a test program for the visual inspection method, sensitivity test images 110, and visual acuity test images 120.
  • the control unit 30 of the visual inspection system 1 can receive the test program and test image data from the server and use them in the visual inspection.
  • the control unit 30 can also store the results of the visual inspection of the subject 2 and transmit them to the server.
  • the server 50 is an example of an external information processing device.
  • the server 50 can be connected to multiple visual inspection systems 1C via a network, and can collect the results of visual inspections from each visual inspection system 1C.
  • the visual inspection results collected by the server can be used to improve the visual inspection. For example, if it is known in advance that the visual characteristics of a subject about to be inspected are similar to those of subjects who have undergone visual inspections in the past, the burden of the inspection can be reduced by omitting some or all of the subject's visual inspection.
  • the results of multiple visual inspections can be used to update the inspection program, sensitivity inspection images 110, and visual acuity inspection images 120, or to develop new inspection programs, sensitivity inspection images 110, and visual acuity inspection images 120 to perform more accurate visual inspections.
  • FIG. 16 is a schematic diagram of a visual inspection system 1D according to a modified embodiment of the present invention.
  • the subject 2 wears a head-mounted display device 10D, an example of a wearable display device.
  • the display device is connected to the server 50D via a wired or wireless connection, and receives the test program to be displayed and data on the sensitivity test image 110 and visual acuity test image 120 from the server 50D.
  • the subject can take the visual test by looking at the sensitivity test image 110 and visual acuity test image 120 displayed on the display device 10D.
  • the subject 2 inputs information into the display device, such as whether they find the sensitivity test image 110 dazzling, and whether they can recognize the optotype 121 on the visual acuity test image 120.
  • There are no particular limitations on the method by which the subject inputs information into the display device 10D and this may be via an operation unit connected to the display device, or by detecting voice or the subject's head movement.
  • the examiner does not need to operate the display device to perform the visual test on the subject, making it easy to perform the visual test. Furthermore, if the subject's smartphone is used as the display device, there are no restrictions on where the visual test can be performed, making it easy for the subject to perform the visual test.
  • a visual testing method for measuring the visual acuity of a subject using a test image comprising: the type of test image includes a visual acuity test image, the visual acuity test image includes a visual target for measuring the visual acuity of the subject and a background area around the visual target, the visual target having a color different from the color of the background area;
  • the visual inspection method includes: a visual acuity test image presenting step of presenting the visual acuity test image to the subject; a vision test image changing step of changing at least one of the brightness and color of the vision test image; a visual acuity measurement step of measuring the visual acuity of the subject by testing whether the subject can recognize the visual target when viewing the visual acuity test image; Including, Visual inspection methods.
  • the type of the inspection image includes a sensitivity inspection image, the sensitivity inspection image includes an inspection area and a peripheral area around the inspection area, the inspection area having a color different from the color of the peripheral area,
  • the visual inspection method includes: a sensitivity test image presenting step of presenting the sensitivity test image to the subject; a sensitivity test image modifying step of modifying at least one of the luminance and color of the sensitivity test image; a condition acquisition step of acquiring at least one of luminance and color of the sensitivity test image that satisfies a predetermined test condition when the subject views the sensitivity test image; Further comprising: In the visual acuity test image changing step, at least one of the luminance and the color of the visual acuity test image is changed based on at least one of the luminance and the color acquired in the condition acquiring step so as to satisfy the predetermined test condition.
  • Item 1 The visual inspection method according to item 1.
  • the predetermined test conditions include a first test condition that is a condition under which the subject does not feel any glare from the sensitivity test image when the subject views the sensitivity test image, Item 3.
  • a filter that changes the intensity of transmitted light is inserted or removed between the subject and the sensitivity test image, thereby changing the brightness of the sensitivity test image.
  • Item 5 The visual inspection method according to item 3 or 4.
  • the predetermined inspection conditions include a second inspection condition under which the subject can recognize a difference in color between the surrounding area and the inspection area when the subject views the sensitivity inspection image.
  • Item 3. The visual inspection method according to item 2.
  • a color of the sensitivity test image is changed while satisfying the first inspection condition
  • the predetermined inspection conditions include a second inspection condition under which the subject can recognize a difference in color between the surrounding area and the inspection area when the subject views the sensitivity inspection image.
  • Item 6 The visual inspection method according to any one of items 3 to 5.
  • the visual acuity test image presenting step the visual acuity test image is displayed on a display device based on the image signal
  • the vision test image changing step at least one of brightness and color of the vision test image is changed by changing the image signal.
  • Item 14 The visual inspection method according to any one of items 1 to 13.
  • a filter that changes at least one of the intensity and spectrum of transmitted light is inserted or removed between the subject and the visual acuity test image, thereby changing at least one of the brightness and color of the visual acuity test image.
  • Item 14 The visual inspection method according to any one of items 1 to 13.
  • the test area is arranged so that, when the subject looks at approximately the center of the sensitivity test image, light emitted from the visual target is imaged in an area inside the fovea centralis on the retina of the subject, the color of the target is different from the color of the surrounding area in at least one of an R component, a G component, and a B component in an RGB space; Item 17.
  • the visual inspection method according to any one of items 2 to 16.
  • the test area is arranged so that, when the subject looks at approximately the center of the sensitivity test image, light emitted from the visual target forms an image within a range of 2 degrees from the center of the subject's retina. Item 17.
  • the visual inspection method according to any one of items 2 to 16.
  • a visual inspection program for causing a computer to execute a method including the steps of:
  • the predetermined test conditions include a first test condition that is a condition under which the subject does not feel any glare from the sensitivity test image when the subject views the sensitivity test image, Item 20.
  • the predetermined inspection conditions include a second inspection condition under which the subject can recognize a difference in color between the surrounding area and the inspection area when the subject views the sensitivity inspection image.
  • Item 20 The visual inspection program according to item 19.
  • a color of the sensitivity test image is changed while satisfying the first inspection condition
  • the predetermined inspection conditions include a second inspection condition under which the subject can recognize a difference in color between the surrounding area and the inspection area when the subject views the sensitivity inspection image. 22.
  • the test area is arranged so that, when the subject looks at approximately the center of the sensitivity test image, light emitted from the visual target is imaged in an area inside the fovea centralis on the retina of the subject, the color of the target is different from the color of the surrounding area in at least one of an R component, a G component, and a B component in an RGB space; 28.
  • the visual inspection program according to any one of items 19 to 27.
  • the test area is arranged so that, when the subject looks at approximately the center of the sensitivity test image, light emitted from the visual target forms an image within a range of 2 degrees from the center of the subject's retina.
  • a vision testing system for measuring a subject's visual acuity using a test image comprising: the type of test image includes a visual acuity test image, the visual acuity test image includes a visual target for measuring the visual acuity of the subject and a background area around the visual target, the visual target having a color different from the color of the background area;
  • the visual inspection system includes: a visual acuity test image presentation unit that presents the visual acuity test image to the subject; a vision test image change unit that changes at least one of the brightness and color of the vision test image; a visual acuity measurement unit that measures the visual acuity of the subject by testing whether the subject can recognize the optotype when viewing the visual acuity test image; Including, Visual inspection system.
  • the type of the inspection image includes a sensitivity inspection image, the sensitivity inspection image includes an inspection area and a peripheral area around the inspection area, the inspection area having a color different from the color of the peripheral area,
  • the visual inspection system includes: a sensitivity test image presenting unit that presents the sensitivity test image to the subject; a sensitivity test image change unit that changes at least one of the luminance and color of the sensitivity test image; a condition acquisition unit that acquires at least one of luminance and color of the sensitivity test image that satisfies a predetermined test condition when the subject views the sensitivity test image; Further comprising: the visual acuity test image change unit changes at least one of the luminance and the color of the visual acuity test image based on at least one of the luminance and the color acquired by the condition acquisition unit, while satisfying the predetermined test conditions; Item 31.
  • the visual inspection system according to item 30.
  • the sensitivity inspection image change unit changes the luminance of at least the peripheral area of the inspection area and the peripheral area;
  • the predetermined test conditions include a first test condition that is a condition under which the subject does not feel any glare from the sensitivity test image when the subject views the sensitivity test image, Item 32.
  • the visual inspection system according to item 31.
  • the condition acquisition unit acquires one of the luminances of the surrounding area that satisfy the first inspection condition.
  • the visual inspection system according to item 32.
  • the sensitivity test image change unit changes a difference between a color of the peripheral region and a color of the test region;
  • the predetermined inspection conditions include a second inspection condition under which the subject can recognize a difference in color between the surrounding area and the inspection area when the subject views the sensitivity inspection image.
  • Item 32 The visual inspection system according to item 31.
  • the condition acquisition unit acquires one of the plurality of differences between the color of the surrounding area and the color of the inspection area that satisfy the second inspection condition.
  • Item 36 The visual inspection system according to item 35.
  • the sensitivity test image changing unit changes the color of the sensitivity test image while satisfying the first test condition;
  • the predetermined inspection conditions include a second inspection condition under which the subject can recognize a difference in color between the surrounding area and the inspection area when the subject views the sensitivity inspection image.
  • the visual inspection system according to any one of items 32 to 34.
  • the visual acuity measurement unit presents to the subject the visual acuity test image whose luminance satisfies the first test condition and whose color satisfies the second test condition. Item 39.
  • the visual acuity test image changing unit sequentially or simultaneously presents the plurality of visual acuity test images that satisfy the predetermined test conditions to the subject; the visual acuity measurement unit measures whether the subject can recognize the presence and shape of the visual target in the visual acuity test images when the subject views the presented visual acuity test images.
  • Item 39 The visual inspection system of any one of items 31 to 39.
  • the visual acuity test image changing unit changes at least one of the size and shape of the visual target while the predetermined test condition is satisfied; and the visual acuity measuring unit measures whether the subject can visually recognize the existence and shape of the visual target.
  • Item 41. A visual inspection system according to item 40.
  • the sensitivity test image presenting unit is a display device that displays the test image based on an image signal,
  • the sensitivity test image change unit outputting the image signal to display the sensitivity test image on the sensitivity test image display unit; changing at least one of the luminance and color of the sensitivity test image by changing the image signal to be output; 42.
  • the visual inspection system according to any one of items 31 to 41.
  • Information 43 a communication interface communicably connected to an external information processing device; a storage unit that stores information indicating at least one of the luminance and color values of the sensitivity test image that satisfies the predetermined test condition and information indicating the visual acuity of the subject; Further provided with transmitting the information stored in the storage unit to the external information processing device via the communication interface; 42.
  • the visual inspection system according to any one of items 31 to 41.
  • the sensitivity test image presenting unit is a display device that displays the test image based on an image signal, the visual inspection system is wearable on the subject's head; 42.
  • the visual inspection system according to any one of items 31 to 41.
  • the visual acuity test image presentation unit is a display device that displays the visual acuity test image based on an image signal,
  • the vision test image changing unit outputting the image signal to display a pre-visual test image on the visual acuity test image display unit; changing at least one of the brightness and color of the vision test image by changing the image signal to be output; Item 46.
  • the vision inspection system according to any one of items 30 to 45.
  • a filter that can be inserted or removed between the subject and the vision test image and that changes the intensity of transmitted light; the visual acuity test image changing unit changes at least one of brightness and color of the visual acuity test image by inserting or removing the filter between the subject and the visual acuity test image.
  • Item 46. The vision inspection system according to any one of items 30 to 45.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

L'invention concerne un système d'inspection visuelle comprenant : une unité de présentation d'image d'inspection d'acuité visuelle qui présente, à un sujet, une image d'inspection d'acuité visuelle comprenant une cible visuelle pour mesurer l'acuité visuelle du sujet et une région d'arrière-plan autour de la cible visuelle ; une unité de changement d'image d'inspection d'acuité visuelle qui change la luminance et/ou la teinte de l'image d'inspection d'acuité visuelle ; et une unité de mesure d'acuité visuelle qui mesure l'acuité visuelle du sujet en inspectant si le sujet peut reconnaître la cible visuelle lors de la visualisation de l'image d'inspection d'acuité visuelle.
PCT/JP2025/001550 2024-03-05 2025-01-20 Procédé d'inspection visuelle, système d'inspection visuelle et programme d'inspection visuelle Pending WO2025187223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024-032728 2024-03-05
JP2024032728 2024-03-05

Publications (2)

Publication Number Publication Date
WO2025187223A1 true WO2025187223A1 (fr) 2025-09-12
WO2025187223A8 WO2025187223A8 (fr) 2025-10-02

Family

ID=96990433

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/001550 Pending WO2025187223A1 (fr) 2024-03-05 2025-01-20 Procédé d'inspection visuelle, système d'inspection visuelle et programme d'inspection visuelle

Country Status (2)

Country Link
TW (1) TW202535295A (fr)
WO (1) WO2025187223A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05130975A (ja) * 1991-05-08 1993-05-28 Carl Zeiss:Fa 視力検査装置
JP2013526920A (ja) * 2010-04-30 2013-06-27 ミシェル・ギヨン 動的な視力および視覚コントラストを測定するための装置および方法
JP2023027484A (ja) * 2021-08-17 2023-03-02 株式会社中京メディカル 視標表示装置、視標提示方法及びプログラム
JP2023034658A (ja) * 2021-08-31 2023-03-13 三井化学株式会社 視機能検査支援装置、視機能検査支援方法、及び、視機能検査支援プログラム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05130975A (ja) * 1991-05-08 1993-05-28 Carl Zeiss:Fa 視力検査装置
JP2013526920A (ja) * 2010-04-30 2013-06-27 ミシェル・ギヨン 動的な視力および視覚コントラストを測定するための装置および方法
JP2023027484A (ja) * 2021-08-17 2023-03-02 株式会社中京メディカル 視標表示装置、視標提示方法及びプログラム
JP2023034658A (ja) * 2021-08-31 2023-03-13 三井化学株式会社 視機能検査支援装置、視機能検査支援方法、及び、視機能検査支援プログラム

Also Published As

Publication number Publication date
WO2025187223A8 (fr) 2025-10-02
TW202535295A (zh) 2025-09-16

Similar Documents

Publication Publication Date Title
JP7337360B2 (ja) 視覚特性の検査方法、光学フィルタの特性決定方法、光学フィルタ、視覚特性検査用の光学素子セット、および視覚特性の検査用画像
CN109640786B (zh) 视觉功能检查及光学特性计算系统
KR20160017079A (ko) 주관적인 거리측정에 기초한 눈의 굴절 이상 측정 시스템 및 방법
CN109008939B (zh) 检查装置以及检查方法
US7673991B2 (en) Method and device for measuring retinal stray light
EP1213990A1 (fr) Appareil pour mesurer des performances visuelles
JP6733160B2 (ja) 検眼装置、および検眼プログラム
JPWO2021166996A5 (fr)
Sato et al. Discrimination of colors by red–green color vision-deficient observers through digitally generated red filter
Parmar et al. Does an iPad fixation disparity test give equivalent results to the Mallett near fixation disparity test?
JP7722670B2 (ja) 視覚特性の検査画像セット、視覚特性の検査方法、補正フィルタの特性決定方法、および、補正フィルタ
JP6440054B2 (ja) 光学素子作製方法及び光学素子、並びに、色調整プログラム及び色調整装置
WO2025187223A1 (fr) Procédé d'inspection visuelle, système d'inspection visuelle et programme d'inspection visuelle
JP6828234B2 (ja) 検眼情報表示装置、検眼情報表示プログラム
WO2024170703A1 (fr) Système d'optométrie pour détermination, pour chaque oeil d'un individu, d'une valeur mésopique d'une puissance de correction de vision d'un verre correcteur
JP6733161B2 (ja) 検眼装置、および検眼プログラム
CN109349999B (zh) 一种主观验光方法
JPWO2016163338A1 (ja) 光学素子の作製方法及び光学素子、並びに、色覚特性の検査プログラム、検査装置及び色覚検査画像セット
KR20120132801A (ko) 대비감도 측정장치 및 방법
Sipos et al. Vision tests of sensory judges-review
Boccardo et al. Validity and repeatability of three different techniques of binocular balancing
EP4665202A1 (fr) Système d'optométrie pour détermination, pour chaque oeil d'un individu, d'une valeur mésopique d'une puissance de correction de vision d'un verre correcteur
WO2023195404A1 (fr) Dispositif de test de vision et ensemble de dispositifs de test de vision
Sodhi et al. Are X-chrome lenses an occupational succor for the color vision defectives
JP2025118373A (ja) 表示制御装置、表示制御方法及び表示制御プログラム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 25768159

Country of ref document: EP

Kind code of ref document: A1