WO2024252706A1 - Ophthalmic examination visual target, ophthalmic examination device, and program - Google Patents

Abstract

This ophthalmic examination visual target comprises a plurality of visual targets as constituent elements. The visual targets each have, as constituent elements, a contour portion having a predetermined line width for distinguishing a background portion from a visual target body in the visual target, and a visual target internal portion having a predetermined area enclosed by the contour portion. The visibility of the visual targets is varied by varying the color difference between the contour portion, and the background portion and the visual target internal portion in each visual target.

Description

Optic target, optometric device and program

The present invention relates to an eye examination target, an eye examination device, and a program.
This application claims priority based on Japanese Patent Application No. 2023-095678, filed on June 9, 2023, the contents of which are incorporated herein by reference.

　Optotypes are used to measure visual cognitive function. For example, Patent Document 1 describes the Cinelen character optotype.

Japanese Patent Application Publication No. 2002-233502

The eye test optotype according to the first aspect of the present invention has as its components a plurality of optotypes, and the optotypes have as their components a contour portion of a predetermined line width that separates the background portion and the visual specimen within the optotype, and an interior portion of the optotype having a predetermined area enclosed by the contour portion, and the visibility is differentiated by varying the color difference between the background portion and the interior portion of the optotype and the contour portion.

The eye examination device according to the second aspect of the present invention includes a first acquisition unit that acquires an instruction to start an examination using the eye examination target described above, and a first presentation unit that presents the eye examination target to the subject in accordance with the instruction acquired by the first acquisition unit.

The program according to the third aspect of the present invention causes a computer to execute a first acquisition step of acquiring an instruction to start an examination using the eye test target described above, and a first presentation step of presenting the eye test target to a subject in accordance with the instruction acquired by the first acquisition step.

FIG. 1 is a conceptual diagram showing an example of a mode of testing using an eye test target according to the present embodiment. FIG. 2 is a diagram for explaining an example of components of a visual target according to the present embodiment. FIG. 2 is a diagram for explaining an example of components of an eye test target according to the present embodiment. FIG. 11 is a diagram for explaining a first modified example of the eye test target according to the embodiment. FIG. 13 is a diagram for explaining a second modified example of the eye test target according to the embodiment. FIG. 1 is a block diagram of a system according to an embodiment of the present invention. FIG. 2 is a functional configuration diagram for explaining an example of the functional configuration of a terminal device according to the present embodiment. FIG. 2 is a sequence diagram for explaining an example of a processing flow of the system according to the present embodiment. FIG. 11 is a functional configuration diagram for explaining the functional configuration of a first modified example of the terminal device according to the embodiment. FIG. 11 is a sequence diagram for explaining an example of a processing flow of a system of a first modified example according to the embodiment. FIG. 11 is a functional configuration diagram for explaining an example of a functional configuration of a second modified example of a terminal device according to the present embodiment. FIG. 11 is a sequence diagram for explaining an example of a processing flow of a system of a second modified example according to the embodiment.

[Embodiment]
The eye examination target, eye examination device, and program according to the present embodiment will be described in detail below with reference to the accompanying drawings, showing preferred embodiments. Note that the present embodiment is not limited to these embodiments, and includes various modifications or improvements. In other words, the components described below include those that a person skilled in the art can easily imagine, and those that are substantially the same, and the components described below can be appropriately combined. In addition, the components of the present embodiment can be omitted, replaced, or modified in various ways without departing from the scope of the present invention.

[overview]
The quality of vision is evaluated by visual acuity and contrast sensitivity, etc. Contrast targets include test targets for general visual acuity tests such as the Landolt ring target and the Cinelen character target, and test targets for contrast sensitivity using Gabor stimuli.

Sometimes, vision test targets do not emphasize whether the outlines of figures are clearly visible. For example, the Landolt ring target and the Cinelen letter target are test targets for general visual acuity testing that have clear outlines. However, in tests using the Landolt ring target, even if the eyes are not focused and the image appears blurry, it may be determined that the image is legible if the direction of the cut in the Landolt ring can be distinguished from the shades of black and white. In tests using the Cinelen letter target, even if the eyes are not focused and the image appears blurry, it may be determined that the image is legible if the shape of the letters can be distinguished from the shades of black and white. In addition, contrast sensitivity test targets using Gabor stimuli are targets that do not have clear outlines to begin with.

Also, the Landolt ring is generally displayed as a letter like a C, with the inside of the letter filled in. Therefore, even if the subject has difficulty in clearly viewing the outline of the test optotype, the subject can infer the overall image of the test optotype from the contrast between the test optotype and the background. Even if the subject is able to clearly view the outline of the test optotype by wearing glasses or contact lenses (hereinafter, when simply describing glasses, it may include devices for correcting vision such as contact lenses), the subject is able to infer the overall image of the test optotype even before wearing the glasses, so there is a problem that it is difficult to realize the effect of improving visual cognitive function by wearing glasses. Therefore, this embodiment provides an optotype that makes it easy to realize the effect of improving visual cognitive function by wearing glasses.

1 is a conceptual diagram for explaining an example of an embodiment of an examination using an eye test target according to the present embodiment. With reference to FIG. 1, an embodiment of an examination using an eye test target 10 will be explained. An examination using an eye test target 10 is performed, for example, at an eyeglass store. In the following description, a person undergoing the examination will be described as an examinee 1, and a person performing the examination will be described as an examiner. The examinee 1 undergoes an examination using an eye test target 10 to measure his/her visual cognitive function. More specifically, an examination is performed on the improvement of cognitive function before and after the examinee 1 wears the glasses 2. The solid arrow in FIG. 1 shows a schematic line of sight of the examinee 1 undergoing the examination when looking at the eye test target 10 at a predetermined distance. The examiner has the examinee 1 visually recognize the eye test target 10 presented at a predetermined distance from the examinee 1. The examination may be performed one eye at a time, with one eye closed (or one eye covered by a shield not shown) and the other eye open. The test may also be performed on both eyes simultaneously with both eyes open. The subject 1 visually recognizes the content displayed on the eye test target 10 and responds verbally or via a tablet terminal device or the like about what he or she recognizes. In a test using the eye test target 10, visual cognitive function is measured based on the responses of the subject 1.

The specified distance between the subject 1 and the eye test target 10 may be set appropriately depending on the conditions of the test using the eye test target 10, the size of the eye test target 10, etc. The eye test target 10 may be presented to the subject 1 by a display of a tablet terminal device or a personal computer, a screen of a projector or a cinema projector, a printed material such as paper, etc. The eye test target 10 may be presented to the subject 1 by a method other than using a display, a screen, or a printed material such as paper, etc.

FIG. 1(A) is a diagram for explaining the mode of testing using an eye test target 10 before wearing glasses 2. In FIG. 1(A), it is preferable for the subject to undergo the test with the naked eye. However, if subject 1 regularly wears glasses or contact lenses for vision correction, he or she may continue to wear these. Furthermore, even if subject 1 has previously undergone vision restoration surgery such as LASIK (laser in situ keratomileusis) or ICL (implantable contact lens), he or she can undergo the test according to this embodiment.

FIG. 1(B) is a diagram for explaining the mode of testing using an eye test target 10 when subject 1 is wearing spectacles 2. In FIG. 1(B), subject 1 undergoes testing while wearing spectacles 2. Testing using eye test target 10 may be performed by comparing the results when subject 1 is not wearing spectacles 2 as in FIG. 1(A) with the results when subject 1 is wearing spectacles 2 as in FIG. 1(B). When testing using eye test target 10 is performed both when not wearing spectacles 2 and when wearing spectacles 2, subject 1 can feel the improvement in visual cognitive function due to wearing spectacles 2.

[Optical target]
Fig. 2 is a diagram for explaining an example of components of the optotype according to this embodiment. With reference to Fig. 2, an example of components of the optotype 11 included in the eye test optotype 10 according to this embodiment will be explained. The eye test optotype 10 includes a plurality of optotypes 11 with different visibility. Each optotype 11 has a background portion 12 and a visual specimen body 13 as components.

The visual specimen body 13 has a contour portion 14 and an inside of the optotype 15 as its components. The visual specimen body 13 has a shape such as a letter that allows the subject 1 to recognize the content or name of the visual specimen body 13 when visually recognized. The shape of the visual specimen body 13 is not limited to a letter, but may be a two-dimensional figure, a symbol, or a combination thereof. The visual specimen body 13 may be, for example, an illustration of a cat. The size of the visual specimen body 13 may be appropriately set to a size suitable for the test depending on the situation of the test using the eye test optotype 10. For example, when the visual specimen body 13 is a letter, an example of the character size may be about 72 points when the distance between the subject 1 and the eye test optotype 10 is 10 cm to 40 cm.

The background portion 12 is the area within the optotype 11 other than the visual specimen object 13. The background portion 12 may have any color as a component, so long as it can appropriately measure the cognitive function of the subject 1 as the eye test optotype 10. Specifically, when the visual specimen object 13 is black, it is preferable that the background portion 12 be white in order to make the visual specimen object 13 stand out.

The contour portion 14 is a line having a predetermined line width that separates the background portion 12 from the visual specimen body 13. The predetermined line width may be any line width that allows the test using the eye test target 10 to be performed appropriately, and may be set appropriately depending on the type of test. The visibility of the visual specimen body 13 can be controlled by adjusting the color of the contour portion 14 while fixing the line width of the contour portion 14, or by adjusting the colors of the background portion 12 and the inside of the target 15. Specifically, the visibility of the visual specimen body 13 can be improved by making the color of the contour portion 14 significantly different from the background portion 12 and the inside of the target 15. The visibility of the visual specimen body 13 can be reduced by making the color of the contour portion 14 similar to the color of the background portion 12 and the inside of the target 15. The contour portion 14 may be any color as long as it can appropriately measure the cognitive function of the subject 1 as the eye test target 10.

The inside of the target 15 is a region having a predetermined area enclosed by the outline portion 14. The predetermined area may be any area greater than 0. The color of the inside of the target 15 may have any color as a component, so long as it can appropriately measure the cognitive function of the subject 1 as an eye test target 10. For example, it is preferable for the inside of the target 15 to be composed of the same color as the background portion 12.

In a test using the eye test target 10, the colors of the background portion 12, the outline portion 14, and the inside of the target 15 are set so that it is difficult to guess the overall image of the visual specimen 13 from the color difference between the visual specimen 13 and the background portion 12. The color difference is defined between two colors, and for example, the larger the color difference, the easier it is to distinguish the difference between the two colors, and the smaller the color difference, the more difficult it is to distinguish the difference between the two colors. Among the color differences, the difference in luminance between the background portion 12 and the outline portion 14 divided by the luminance of the background portion 12 is called contrast, and is expressed as a percentage. Note that the color difference may be, for example, the Euclidean distance between two colors in a certain color space. A certain color space may be, for example, composed of a combination of RGB (Red, Green, Blue).

For example, the Landolt ring target has a filled-in interior, so that even if the eyes are not focused, it may be possible to estimate the overall image of the target from the color difference between the target and the target background. The eye test target 10 has the target interior 15 of the target 13 and the background 12 in the same color, so that it is difficult for the subject 1 to estimate the overall image of the target 13 unless the subject 1 focuses his or her eyes to recognize the outline 14 of the target 13. In an examination using the eye test target 10, it is preferable that the outline 14 is grayscale and the background 12 and the target interior 15 are white, so that the subject 1's individual differences in color vision do not affect the difficulty of recognizing the outline 14.
In order to reduce the visibility of the target 11, the color of the outline portion 14, the color of the background portion 12, and the color of the inside 15 of the target may be similar colors.

Note that at the boundary between the contour portion 14 and the background portion 12, if the change in pixel value from the contour portion 14 to the background portion 12 is small, the boundary may become blurred. If the boundary is blurred, even if the subject 1 improves his/her visual cognitive function by wearing glasses 2 or other methods, he/she will still be unable to clearly recognize the contour portion 14, and therefore there is a problem that the improvement in visual cognitive function is difficult to realize. Therefore, in order to clarify the boundary between the contour portion 14 and the background portion 12, it is preferable that the pixel value of the contour portion 14 and the pixel value of the background portion 12 differ by a predetermined value or more. Here, the predetermined value may be any value as long as the cognitive function of the subject 1 can be appropriately measured using the eye test target 10. Note that the pixel value of the contour portion 14 of the visual specimen body 13 may differ by a predetermined value or more from the pixel value of the target interior 15.

When the distance between the subject 1 and the optotype 11 is in the range of 10 cm to 40 cm and the line width of the contour portion 14 is less than 0.25 points, the visibility of the optotype 11 may be too low and the optotype 10 may not be suitable for measuring the cognitive functions of a large number of people under the same conditions. Also, when the line width of the contour portion 14 is 1.5 points or more, even if the subject 1 cannot clearly see the contour portion 14, it may be possible to infer the overall image of the visual specimen 13 from the general shape of the contour portion 14. Therefore, for example, when the distance between the subject 1 and the optotype 11 is in the range of 10 cm to 40 cm, the predetermined line width is preferably 0.25 points or more and less than 1.5 points.

[Eye test target]
FIG. 3 is a diagram for explaining an example of components of the eye test optotype according to the present embodiment. With reference to FIG. 3, an example of components of the eye test optotype 10 will be described. The eye test optotype 10 has optotypes 11a to 11c and color difference information 16a to 16c as components. In the following description, when the optotypes 11a to 11c, which are multiple optotypes, are not distinguished from each other, they may be simply described as optotype 11. The components of the optotype 11 are also described in the same manner. When the color difference information 16a to 16c, which are multiple color difference information, are not distinguished from each other, they may be simply described as color difference information 16. The colors of the outline portions 14 of the multiple optotypes 11 are adjusted so that the visibility is different from each other. In the test using the eye test optotype 10, the visual cognitive function of the subject 1 is tested according to the type of optotype 11 that the subject 1 can see among the multiple optotypes 11. The number of optotypes 11 included in the eye test optotype 10 may be changed as appropriate depending on the mode of the test. In the illustrated example, the eye test optotype 10 includes three optotypes 11, ie, optotypes 11a to 11c.

The color difference information 16 is displayed at a position corresponding to the optotype 11, and is information indicating the visibility of the corresponding optotype 11. The color difference information 16 may be a value corresponding to the optotype color difference, which is the color difference between the color of the outline portion 14 of the optotype 11 and the color of the background portion 12. The color difference information 16 may also be a number that is conveniently assigned to the optotype 11. The position at which the color difference information 16 is displayed may be, for example, the lower right position of the optotype 11, as shown in the figure. Note that the color difference information 16 does not necessarily have to be displayed, as it is intended to make the test more convenient.

Specifically, the optotype 11a has as its components a white background portion 12a and a visual specimen body 13a of a character string of "ai" with a predetermined character size. The visual specimen body 13a is grayscale and has as its components an outline portion 14a with a predetermined line width and a white optotype interior portion 15a. The color difference information 16a is displayed as the number "1" at the lower right position of the optotype 11.
In the illustrated example, the color difference information 16 is a serial number that is assigned for convenience.

Optotypes 11b and 11c are similar to optotype 11a in that they have as their components a white background portion (12b, 12c) and a visual specimen body (13b, 13c) of a character string with the same character size as optotype 11a. Also, visual specimen body 13b and visual specimen body 13c are similar to visual specimen body 13a in that they are grayscale and have as their components an outline portion (14b, 14c) with the same line width as optotype 11a and a white optotype interior (15b, 15c). Furthermore, color difference information 16b and color difference information 16c are similar to color difference information 16a in that they are displayed at the lower right of the optotype as a position corresponding to the optotype (11b, 11c).

On the other hand, visual specimen body 13b differs from visual specimen body 13a in that it is the character string "dog". Also, visual specimen body 13c differs from visual specimen body 13a in that it is the character string "vegetables". In order to prevent subject 1 from inferring other visual symbols 11 from the visual symbol 11 that he or she recognizes, each of visual specimen bodies 13a to 13c may use unrelated character strings, symbols, or signs. In the example shown in the figure, each of "love", "dog", and "vegetables" is an unrelated character string. However, multiple visual symbols 11 may be character strings that form a sentence when read consecutively.

The contour portions 14a, 14b, and 14c have different colors as their components. The optotypes 11 included in the eye test optotype 10 have smaller optotype color difference and lower visibility from optotype 11a to optotype 11c. In the example shown, the contrast of the optotypes 11 included in the eye test optotype 10 is 100% for optotype 11a, 60% for optotype 11b, and 20% for optotype 11c. In a test using the eye test optotype 10, multiple optotypes 11 with different visibility are presented to the subject 1, and the visual cognitive function of the subject 1 is measured based on which optotype 11 the subject 1 can recognize.

In the illustrated example, the color difference information 16a to 16c are assigned consecutive numbers. The color difference information 16 may be used as an identification number when indicating the optotype 11 to be viewed by the subject 1.

In this embodiment, an example of the eye test optotype 10 is shown in which the background portions 12 of the multiple optotypes 11 are a uniform color, and the outline portions 14 of the multiple optotypes 11 are different colors. However, this embodiment is not limited to this example, and for example, the background portions 12 of each optotype 11 may be different colors.

In this embodiment, an example is shown in which the eye test optotype 10 has multiple optotypes 11 with the same character size on the visual specimen body 13. However, this embodiment is not limited to this example, and the character size of the visual specimen body 13 may be different for each optotype 11.

In this embodiment, the eye test optotype 10 has an example in which the contrast of the optotype 11a is 100%, the contrast of the optotype 11b is 60%, and the contrast of the optotype 11c is 20%, resulting in a contrast difference of 40% for each optotype 11. However, this embodiment is not limited to this example, and the eye test optotype 10 may have a contrast difference of 0.8% for each optotype 11 according to the type of examination. Specifically, the eye test optotype 10 may have a contrast of 12.5% for the optotype 11a, 11.7% for the optotype 11b, and 10.9% for the optotype 11c. By making the contrast difference finer, the subject 1 can see different optotypes 11 before and after putting on the glasses 2, making it easier to realize the improvement in visual cognitive function by putting on the glasses 2.

[First Modification of Eye Test Scheme]
FIG. 4 is a diagram for explaining a first modified example of the eye test optotype according to the present embodiment. With reference to FIG. 4, an eye test optotype 10A, which is a first modified example of the eye test optotype 10, will be described. The eye test optotype 10A is different from the eye test optotype 10 in that the first direction of the eye test optotype includes an optotype 11 with the same optotype color difference. In the test, if the visual specimen body 13 is a simple character, figure, or symbol, the subject 1 may answer by guessing and may accidentally get the correct answer. Therefore, in the eye test optotype 10A, multiple optotypes 11 are prepared for the same color difference, and a test using the multiple optotypes 11 is performed. As a result of the test using the multiple optotypes 11, the visibility of the color difference may be judged based on the percentage of correct answers. For example, when there are five optotypes 11 for the same color difference, it is possible to operate in such a way that the subject 1 is shown the next color difference (optotype 11 in the second direction DR2) with an 80% correct answer rate (i.e., if four are correct). In the following description of the first modified example of the eye test optotype, the description of the matters already described for the eye test optotype 10 may be omitted. The eye test optotype 10A has optotypes 11a to 11d and color difference information 16a to 16c. The visual specimens 13 of the optotypes 11 included in the eye test optotype 10A are character strings of "eye", "dog", "vegetables", and "monkey". "eye" and "dog" are examples of optotypes 11 having the same color difference, and in the illustrated example, two optotypes 11 are prepared for the same color difference. Note that "vegetables" and "monkey" have different color differences, and one optotype 11 is prepared for each color difference.

The first modified example of the eye test optotype will be described in detail below. Eye test optotype 10A is similar to eye test optotype 10 in that the optotype 11 has as its components a white background portion 12 and visual specimen bodies 13 which are character strings of similar character size. Eye test optotype 10A is also similar to eye test optotype 10 in that the visual specimen bodies 13 have as their components a grayscale outline portion 14 which has similar line widths and a white optotype interior 15.

The eye test optotype 10A differs from the eye test optotype 10 in that at least one optotype 11 with the same color of the outline portion 14 is arranged in the first direction DR1, and optotypes 11 with different colors of the outline portion 14 are arranged in the positive direction of the second direction DR2 intersecting with the first direction DR1 so that the value of the optotype color difference decreases in order. In the example shown in the figure, the contrast of the optotypes 11 included in the eye test optotype 10A is 100% for optotype 11a, 100% for optotype 11b, 60% for optotype 11c, and 20% for optotype 11d.

The eye test optotype 10A differs from the eye test optotype 10 in that one color difference information 16a is displayed collectively for the optotypes 11a and 11b arranged in the first direction DR1. Since the optotype color difference is the same for the multiple optotypes 11 arranged in the first direction DR1, one color difference information 16 may be displayed collectively. Note that it is not necessarily required to display one color difference information 16 collectively for multiple optotypes 11 having the same optotype color difference value, and color difference information 16 may be displayed for each optotype 11.

In this embodiment, the eye test optotype 10A is shown as an example in which optotypes 11 with outline portions 14 of different colors are arranged so that the value of the optotype color difference gradually decreases as one moves in the positive direction of the second direction DR2. However, this embodiment is not limited to this example, and optotypes 11 with outline portions 14 of different colors may be arranged so that the value of the optotype color difference gradually decreases as one moves in the negative direction of the second direction DR2.

[Second Modification of Eye Test Scheme]
FIG. 5 is a diagram for explaining a second modified example of the eye test optotype according to the present embodiment. With reference to FIG. 5, an eye test optotype 10B, which is a second modified example of the eye test optotype 10, will be explained. The eye test optotype 10B differs from the eye test optotype 10 in that the optotype 11 included in the eye test optotype is displayed to the subject 1 in a plurality of times. In the following explanation of the second modified example of the eye test optotype, the explanation of the matters already explained in the eye test optotype 10 and the eye test optotype 10A may be omitted. The eye test optotype 10B has optotypes 11a to 11d and color difference information 16a to 16d. The visual specimens 13 of the optotypes 11 included in the eye test optotype 10B are character strings of "love", "dog", "vegetables", and "monkey", respectively.

The eye test optotype 10B is similar to the eye test optotype 10 in that the optotype 11 has as its components a white background portion 12 and an optotype body 13 which is a character string of characters of similar character size. The eye test optotype 10B is also similar to the eye test optotype 10 in that the optotype body 13 has as its components a grayscale outline portion 14 which has a similar line width and a white optotype interior 15. The eye test optotype 10B is also similar to the eye test optotype 10 in that the color difference information 16 is displayed at the lower right position of the optotype 11, which corresponds to the optotype 11.

In the eye test optotype 10B, FIG. 5(A) shows the optotype 11 displayed to the subject 1 the first time, FIG. 5(B) shows the optotype 11 displayed the second time, FIG. 5(C) shows the optotype 11 displayed the third time, and FIG. 5(D) shows the optotype 11 displayed the fourth time. Since the size of the display of a tablet terminal device or a personal computer is limited, it is not possible to display many optotypes 11 at the same time. Therefore, the eye test optotype 10B switches the display from FIG. 5(A) to FIG. 5(D) in sequence. The eye test optotype 10B differs from the eye test optotype 10 in that the optotype 11 with the outline portion 14 of different colors is displayed so that the value of the optotype color difference becomes smaller each time it is displayed. In the example shown in the figure, the contrasts of the optotypes 11 included in the eye test optotype 10B are 100%, 70%, 40%, and 10%, respectively. In a test using the eye test optotype 10B, multiple optotypes 11, some of which have different visibility, are presented to the subject 1, and the visual cognitive function of the subject 1 is measured based on which optotype 11 the subject 1 is able to recognize. The eye test optotypes 10B may be displayed to the subject 1 in sequence using multiple printed materials, such as a picture-story show.

In this embodiment, the eye test optotype 10B is an example in which an optotype 11 having a different color of outline portion 14 is displayed so that the optotype color difference value decreases each time it is displayed to the subject 1. However, this embodiment is not limited to this example, and if the subject 1 is unable to recognize the displayed optotype 11, an optotype 11 having a larger optotype color difference than the optotype 11 that was not recognized and a smaller optotype color difference than the optotype 11 that the subject 1 has been able to recognize up until now may be displayed to the subject 1.

In this embodiment, an example is shown in which the eye test optotype 10B displays one optotype 11 to the subject 1 at a time. However, this embodiment is not limited to this example, and multiple optotypes 11 may be displayed to the subject 1 at a time. If the visual specimen 13 is a simple character, figure, or symbol, such as a Cinelle character optotype, the subject 1 may accidentally hit it even if he or she cannot recognize the outline portion 14. Therefore, in an examination using the eye test optotype 10B, for example, the next optotype 11 may be displayed when a predetermined percentage of the optotypes 11 are recognized out of the multiple optotypes 11 displayed at one time.

[Ophthalmology device]
Next, an example of an optometry apparatus according to this embodiment will be described with reference to FIGS. 6 to 8. FIG.

FIG. 6 is a block diagram of a system according to this embodiment. An example of system 3 will be described with reference to FIG. 6. System 3 includes multiple terminal devices 20 and a server device 21. Terminal device 20-1 and terminal device 20-2 included in system 3 are examples of multiple terminal devices 20. The multiple terminal devices 20 and at least one server device 21 are connected to each other via a network NW. The network NW is a specified communication network configured using lines. An example of the network NW is the Internet. The specified communication network NW is an open network, and devices connected to the communication network NW can communicate with each other using a specified protocol. In the Internet layer of the communication network NW, communication is carried out using the Internet Protocol (IP) or the like.

The terminal device 20 is operated by the examiner or the subject 1. The terminal device 20 receives an instruction to start an examination using the eye test target 10 through the operation of the examiner or the subject 1. The terminal device 20 transmits control information CI to the server device 21 via the network NW. The control information CI broadly includes information for the control unit 32 to control the server device 21. The control information CI includes, for example, information for controlling the server device 21 to transmit information about the eye test target 10 used in the examination to the control unit 32. The terminal device 20 operates as an eye examination device by executing a predetermined program in an examination using the eye test target 10. The terminal device 20 may be, for example, a personal computer, a tablet computer, a smartphone, or other device.

The server device 21 may have information about the eye examination target 10 stored in advance. The server device 21 acquires control information CI from each of the multiple terminal devices 20. The server device 21 transmits target information OI to the terminal device 20 that has transmitted the control information CI. The target information OI includes information about the eye examination target 10. The target information OI includes information about the eye examination target 10 specified by the examiner or the subject 1, for example. The server device 21 is realized, for example, using a computer and software. The server device 21 may also be realized using an electronic circuit as necessary. Furthermore, the server device 21 may be an independent device, and at least a part of the configuration of the server device 21 may be realized as an independent device. At least a part of the functions realized by the server device 21 may also be realized by cloud computing.

The terminal device 20 acquires the optotype information OI transmitted in response to the control information CI from the server device 21. The terminal device 20 displays the acquired optotype information OI to the subject 1. The subject 1 visually checks the contents of the eye test optotype 10 displayed on the terminal device 20 and responds as to whether or not he or she recognizes it. The response as to whether or not he or she recognizes it is given verbally or by operating the terminal device 20. In the test, the visual cognitive function is measured based on the responses of the subject 1. The measurement results of the visual cognitive function may be informed by the examiner verbally or by using printed matter such as paper, or may be displayed on the terminal device 20.

FIG. 7 is a functional configuration diagram for explaining an example of the functional configuration of a terminal device according to this embodiment. An example of the terminal device 20 will be explained with reference to FIG. 7. The terminal device 20 includes a first acquisition unit 31, a control unit 32, and a first presentation unit 33. Each of these functional units is realized, for example, by using a computer and software. Each functional unit may also be realized by using an electronic circuit as necessary. Furthermore, each functional unit does not have to be included in a single device, and the terminal device 20 may be configured from multiple devices. Each functional unit may also include internal storage means such as a semiconductor memory or a magnetic hard disk drive as necessary. The terminal device 20 operates as an eye examination device by executing a predetermined program in an examination using the eye examination target 10.

The first acquisition unit 31 acquires instruction information II through operation by the examiner or the subject 1. The instruction information II includes information regarding an instruction to start an examination using the eye test target 10. The instruction information II may include, for example, information specifying the eye test target 10 to be used in the examination. The first acquisition unit 31 transmits the acquired instruction information II to the control unit 32.

The control unit 32 acquires the instruction information II from the first acquisition unit 31. The control unit 32 transmits the control information CI to the server device 21 based on the acquired instruction information II. In other words, the control unit 32 controls the server device 21 to transmit the eye test target 10 specified by the examiner or the subject 1 to the control unit 32.

The server device 21 acquires control information CI from the control unit 32. In accordance with the acquired control information CI, the server device 21 transmits the optotype information OI to the control unit 32 that transmitted the control information CI. Specifically, the server device 21 transmits information on the eye test optotype 10 specified by the examiner or the subject 1 from information on the eye test optotype 10 stored in advance to the control unit 32.

The control unit 32 acquires the optotype information OI from the server device 21. The control unit 32 transmits the acquired optotype information OI to the first presentation unit 33.

The first presentation unit 33 acquires the optotype information OI from the control unit 32. The first presentation unit 33 displays the eye test optotype 10 contained in the acquired optotype information OI to the subject 1. The subject 1 uses the displayed eye test optotype 10 to measure the visual cognitive function.

In the above example, the terminal device 20 exchanges information with the server device 21 every time it acquires instruction information II from the examiner or subject 1. However, this embodiment is not limited to this example. The terminal device 20 may further have a memory unit as a component, and information related to the eye test target 10 may be stored in the memory unit in advance. Information related to the eye test target 10 may be acquired in advance from the server device 21. When the terminal device 20 has a memory unit as a component, the control unit 32 may acquire instruction information II from the examiner or subject 1, and exchange information with the memory unit based on the acquired instruction information II.

Specifically, the control unit 32 acquires information from the storage unit based on the acquired instruction information II. The control information CI includes information related to the eye test target 10 used in the test. The storage unit transmits target information OI to the control unit 32 according to the acquired control information CI. The control unit 32 searches for and acquires information related to the eye test target 10 used in the test from among the information stored in the storage unit.

In addition, there may be cases where the information on the eye test optotypes 10 pre-stored in the memory unit does not contain information on the eye test optotype 10 specified by the examiner or subject 1. If the specified eye test optotype 10 does not exist in the memory unit, the control unit 32 transmits control information CI to the server device 21. The server device 21 transmits optotype information OI including the eye test optotype 10 specified by the examiner or subject 1 to the terminal device 20 that transmitted the control information CI. In other words, if the information on the specified eye test optotype 10 does not exist in the memory unit, the control unit 32 obtains the necessary information from the server device 21.

FIG. 8 is a sequence diagram for explaining an example of the processing flow of the system according to this embodiment. The processing flow of system 3 will be explained with reference to FIG. 8. In FIG. 8, the examiner or subject 1 operates the terminal device 20 to request an eye test target from the server device 21 via the network NW (step S34). The server device 21 transmits the requested eye test target to the terminal device 20 (step S35). The terminal device 20 displays the transmitted eye test target 10 to the subject 1. As described above, a storage unit (not shown) provided in the terminal device 20 may be used instead of the server device 21.

[First Modification of Optometry Apparatus]
Next, an example of a terminal device 20A which is a first modified example of the terminal device 20 according to the present embodiment will be described with reference to Fig. 9 and Fig. 10. The terminal device 20A differs from the terminal device 20 in that the visual cognitive function of the subject 1 is identified based on the optotype color difference of the optotype 11 which the subject 1 can visually recognize in the eye test optotype 10.

FIG. 9 is a functional configuration diagram for explaining the functional configuration of a first modified example of a terminal device according to this embodiment. With reference to FIG. 9, an example of terminal device 20A, which is a first modified example of terminal device 20, will be explained. Terminal device 20A differs from terminal device 20 in that it further includes a second acquisition unit 41, an identification unit 42, and a second presentation unit 43, and includes a control unit 32A instead of control unit 32. In the configuration of terminal device 20A, components similar to those of terminal device 20 are denoted by similar reference numerals, and explanations thereof may be omitted.

The second acquisition unit 41 acquires visual information VI through operation by the examiner or the subject 1. The visual information VI includes information on the optotype 11 that the subject 1 was able to visually recognize during the examination. The visual information VI may include information on the optotype color difference of the optotype 11 that the subject 1 was able to visually recognize in the eye test optotype 10 displayed to the subject 1, for example. The second acquisition unit 41 transmits the acquired visual information VI to the control unit 32A.

The control unit 32A differs from the control unit 32 in that it further includes an identification unit 42. The control unit 32A acquires visual information VI from the second acquisition unit 41. The identification unit 42 identifies visual information EI based on the visual information VI acquired from the second acquisition unit 41. The visual information EI includes information related to the visual cognitive function of the subject 1. In other words, the identification unit 42 measures the visual cognitive function of the subject 1 based on the optotype color difference of the optotype 11 that the subject 1 was able to visually recognize. The control unit 32A transmits the visual information EI identified by the identification unit 42 to the second presentation unit 43.

The second presentation unit 43 acquires the visual information EI from the control unit 32A. The second presentation unit 43 presents the acquired visual information EI to the examiner or the subject 1. The examiner or the subject 1 may select glasses 2 suitable for improving the visual cognitive function of the subject 1 based on the presented visual information EI.

In the illustrated example, the identification unit 42 is shown as a component of the control unit 32A. However, this embodiment is not limited to this example, and the identification unit 42 may be a component of the server device 21. When the identification unit 42 is a component of the server device 21, the control unit 32A exchanges information with the server device 21.

Specifically, the control unit 32A transmits the visual information VI in addition to the control information CI to the server device 21. The server device 21 acquires the control information CI and the visual information VI. The server device 21 identifies the visual information EI based on the visual information VI in accordance with the acquired control information CI.
The server device 21 transmits the identified visual information EI to the control unit 32A that has transmitted the control information CI and the visual information VI. The control unit 32A transmits the visual information EI acquired from the server device 21 to the second presentation unit 43.

FIG. 10 is a sequence diagram for explaining an example of the processing flow of the system of the first modified example of the terminal device according to this embodiment. The processing flow of the system 3 of the terminal device 20A will be explained with reference to FIG. 10. The processing flow of the system 3 of the terminal device 20A is the processing flow of the system 3 when the server device 21 has the identification unit 42 as a component. The processing illustrated in FIG. 10 includes, in addition to the processing illustrated in FIG. 8, an answer to the visually recognized optotype 11 (step S44) and the presentation of the visual information EI (step S45). In the explanation given with reference to FIG. 10, the same processes as those in FIG. 8 may be omitted by assigning the same reference numerals.

After the processing of step S35 has been performed, the examiner or subject 1 operates the terminal device 20 to respond to the server device 21 about the optotypes 11 that the subject 1 was able to see (step S44). The server device 21 identifies visual information EI including information about the visual cognitive function of the subject 1 based on the optotypes that the subject 1 was able to see. The server device 21 transmits the visual information EI to the terminal device 20 (step S45). The terminal device 20 displays information about the visual cognitive function of the subject 1 to the examiner or subject 1 based on the transmitted visual information EI.

[Second Modification of Optometry Apparatus]
Next, an example of a terminal device 20B which is a second modified example of the terminal device 20 according to the present embodiment will be described with reference to Fig. 11 and Fig. 12. The terminal device 20B differs from the terminal device 20 in that it searches for eyeglasses 2 that improve the visual cognitive function of the subject 1 based on the optotype color difference of the optotype 11 that the subject 1 can visually recognize in the eye test optotype 10.

FIG. 11 is a functional configuration diagram for explaining the functional configuration of a second modified example of a terminal device according to this embodiment. With reference to FIG. 11, an example of terminal device 20B, which is the second modified example of terminal device 20, will be explained. Terminal device 20B differs from terminal device 20 in that it further includes a search unit 51 and a third presentation unit 52, and includes a control unit 32B instead of control unit 32. In the configuration of terminal device 20B, components similar to those of terminal device 20 are given similar reference numerals and descriptions thereof may be omitted.

The control unit 32B differs from the control unit 32 in that it further includes a search unit 51. The control unit 32B acquires visual information VI from the second acquisition unit 41. The search unit 51 searches for information on glasses 2 or lenses that improve the visual cognitive function of the subject 1 based on the visual information VI acquired from the second acquisition unit 41. Information on glasses 2 or lenses that improve the visual cognitive function of the subject 1 is described as glasses information GI. In other words, the search unit 51 searches for glasses 2 suitable for improving the visual cognitive function of the subject 1 based on the optotype 11 that the subject 1 can visually recognize. The control unit 32B transmits the glasses information GI related to the glasses 2 searched for by the search unit 51 to the third presentation unit 52. The search performed by the search unit 51 may be, for example, based on a machine learning method or a rule-based method.

The third presentation unit 52 acquires the glasses information GI from the control unit 32B. The third presentation unit 52 presents information about the glasses 2 identified by the acquired glasses information GI to the examiner or the subject 1. The examiner or the subject 1 may select glasses that suit the subject 1's preferences based on the presented information.

In the illustrated example, the search unit 51 is shown as a component of the control unit 32B. However, this embodiment is not limited to this example, and the search unit 51 may be a component of the server device 21. When the search unit 51 is a component of the server device 21, the control unit 32B exchanges information with the server device 21.

Specifically, the control unit 32B transmits the visual information VI in addition to the control information CI to the server device 21. The server device 21 acquires the control information CI and the visual information VI. The server device 21 searches for the glasses information GI based on the acquired control information CI and visual information VI. The server device 21 transmits the searched glasses information GI to the control unit 32B that has transmitted the control information CI and visual information VI. The control unit 32B transmits the glasses information GI acquired from the server device 21 to the third presentation unit 52.

FIG. 12 is a sequence diagram for explaining an example of the processing flow of the system of the second modified example of the terminal device according to this embodiment. The processing flow of the system 3 of the terminal device 20B will be explained with reference to FIG. 12. The processing flow of the system 3 of the terminal device 20B is the processing flow of the system 3 when the server device 21 has a search unit 51 as a component. The processing illustrated in FIG. 12 includes the transmission of glasses information (S53) in addition to the processing illustrated in FIG. 10. In the explanation given with reference to FIG. 12, the same processes as those in FIG. 10 may be denoted by the same reference numerals and explanations thereof may be omitted.

The server device 21 searches for eyeglasses information GI including information on eyeglasses that improve the visual cognitive function of the subject 1 based on the optotypes that the subject 1 was able to see. The server device 21 transmits the eyeglasses information GI to the terminal device 20 (step S53). The terminal device 20 displays the transmitted visual information EI and eyeglasses information GI to the examiner or the subject 1.

[Summary of this embodiment]
According to the above-mentioned embodiment, the eye test optotype 10 has a plurality of optotypes 11 as components, and the optotype 11 has a contour portion 14 of a predetermined line width that divides the background portion 12 and the visual specimen body 13 in the optotype 11, and an optotype interior 15 having a predetermined area enclosed by the contour portion 14 as components, and the visibility is made different by making the color difference between the background portion 12 and the optotype interior 15 in the optotype 11 different from the contour portion 14. For example, since the inside of the optotype is filled in with the Landolt ring optotype, it may be possible to infer the overall image of the optotype from the color difference between the visual specimen body and the background of the optotype even if the eyes are not focused. According to this embodiment, the eye test optotype 10 has the optotype interior 15 of the visual specimen body 13 and the background portion 12 of the same color, and it is difficult for the subject 1 to infer the overall image of the visual specimen body 13 unless he or she focuses his or her eyes and recognizes the contour portion 14 of the optotype interior 15. The eye test target 10 according to this embodiment can be seen when the eyes are focused, and therefore a target can be provided that allows the subject 1 to easily feel the improvement in cognitive function due to wearing the glasses 2.

Furthermore, according to the above-described embodiment, in the eye test optotype 10, the background portions 12 of the multiple optotypes 11 are of a constant color, and the outline portions 14 of the multiple optotypes 11 are of different colors, thereby varying their visibility. In a test using the eye test optotype 10, multiple optotypes 11 with different visibility are presented to the subject 1, and the visual cognitive function of the subject 1 is measured based on which optotype 11 the subject 1 is able to recognize. During the test, the background portions 12 of the multiple optotypes 11 included in the eye test optotype 10 are of a constant color, thereby reducing the influence of individual differences in color vision. The eye test optotype 10 according to this embodiment can measure the visual cognitive function of the subject 1 during the test, regardless of individual differences in color vision.

Furthermore, according to the above-described embodiment, in the eye test optotype 10, the color of the outline portions 14 of the multiple optotypes 11 is constant, and the colors of the background portions 12 of the multiple optotypes 11 are different from one another to provide different visibility. In a test using the eye test optotype 10, multiple optotypes 11 with different visibility are presented to the subject 1, and the visual cognitive function of the subject 1 is measured based on which optotype 11 the subject 1 is able to recognize. During the test, the color of the outline portions 14 of the multiple optotypes 11 included in the eye test optotype 10 is constant, thereby reducing the influence of individual differences in color vision. The eye test optotype 10 according to this embodiment can measure the visual cognitive function of the subject 1 during the test, regardless of individual differences in color vision.

In addition, according to the above-mentioned embodiment, in the eye test optotype 10, the pixel value of the contour portion 14 of the optotype 11 differs from the pixel value of the background portion 12 by a predetermined value or more. At the boundary between the contour portion 14 and the background portion 12, if the change in pixel value from the pixel value of the contour portion 14 to the pixel value of the background portion 12 is small, the boundary may become blurred. If the boundary is blurred, even if the subject 1 improves his/her visual cognitive function by wearing glasses 2 or the like, he/she still cannot clearly recognize the contour portion 14, so there is a problem that it is difficult to realize the improvement in his/her visual cognitive function. According to this embodiment, since the pixel value of the contour portion 14 of the optotype 11 differs from the pixel value of the background portion 12 by a predetermined value or more, the boundary between the contour portion 14 and the background portion 12 is clear. If the boundary between the contour portion 14 and the background portion 12 is clear, the eye test optotype 10 can be viewed when the eyes are focused. Therefore, the eye test target 10 according to this embodiment can be seen when the eyes are focused, and therefore provides a target that allows the subject 1 to easily feel the improvement in cognitive function due to wearing the glasses 2.

Furthermore, according to the above-mentioned embodiment, in the eye test optotype 10, the background parts 12 of the multiple optotypes 11 are arranged in a constant color in the first direction DR1, and the outline parts 14 constituting the optotypes 11 are arranged in different colors in the second direction DR2 intersecting with the first direction DR1, so that the visibility of the optotypes 11 decreases in the second direction DR2. In the test, even if the subject 1 answers by guess that the visual specimen body 13 is a simple letter, figure, or symbol, he or she may accidentally get the correct answer. According to this embodiment, the eye test optotype 10A can be operated in such a way that, when a predetermined ratio of the optotypes 11 among the multiple optotypes 11 arranged in the first direction DR1 can be recognized in the test, the subject 1 is shown the optotypes 11 in the second direction DR2 rather than the recognized optotypes 11. Therefore, the eye test target 10 according to this embodiment can more accurately measure the visual cognitive function of the subject 1 during the test.

Furthermore, according to the above-described embodiment, the optotype 11 in the eye test optotype 10 is grayscale. According to this embodiment, the test results are unlikely to be affected by individual differences in color vision of the subject 1. Therefore, the eye test optotype 10 according to this embodiment can measure the visual cognitive function of the subject 1 during testing, regardless of individual differences in color vision.

In addition, according to the above-mentioned embodiment, in the eye test optotype 10, the color of the outline portion 14 of the optotype 11 and the color of the background portion 12 are similar colors. For example, in the case of a Landolt ring optotype, the inside of the optotype is filled in, so it may be possible to infer the overall image of the optotype from the color difference between the optotype body and the background of the optotype even if the eyes are not focused. According to this embodiment, the optotype body 13 and the background portion 12 are similar colors, so it is difficult to infer the overall image of the optotype body 13 from the color difference between the optotype body 13 and the background portion 12. Therefore, the subject 1 needs to focus his/her eyes to recognize the outline portion 14 of the optotype interior 15. The eye test optotype 10 according to this embodiment can be viewed when the eyes are focused, so it is possible to provide an optotype that makes it easy for the subject 1 to realize the improvement in cognitive function due to wearing the glasses 2.

Furthermore, according to the above-mentioned embodiment, in the eye test optotype 10, the predetermined line width of the contour portion 14 is 0.25 points or more and less than 1.5 points when the subject 1 views the optotype 11 from a distance of 10 cm to 40 cm. This is because, when the subject 1 views the optotype 11 from a distance of 10 cm to 40 cm and the line width of the contour portion 14 is 1.5 points or more, even if the contour portion 14 is too thick to be clearly visible, it is possible to infer the overall image of the visual specimen 13 from the color difference between the contour portion 14 and the background portion 12. Also, when the line width of the contour portion 14 is less than 0.25 points, the visibility of the optotype 11 is too low, and the eye test optotype 10 is not suitable for measuring the cognitive function of a large number of people under the same conditions. The eye test target 10 according to this embodiment can be seen when the eyes are focused, so it is possible to provide a target that allows the subject 1 to easily feel the improvement in cognitive function due to wearing the glasses 2.

Furthermore, according to the above-described embodiment, in the eye test optotype 10, color difference information 16 including at least one of a value corresponding to the optotype color difference, which is the color difference between the color of the outline portion 14 of the optotype 11 and the color of the background portion 12, or a number assigned to the optotype, is written at a position corresponding to the optotype. According to this embodiment, the color difference information 16 can be used as an identification number when instructing the optotype 11 to be viewed by the subject 1. Furthermore, the color difference information 16 can be used by the subject 1 to grasp the degree of visual cognitive function by displaying the optotype color difference. Therefore, the eye test optotype 10 according to this embodiment can provide a highly convenient optotype for testing.

Furthermore, according to the above-described embodiment, the character size of the multiple optotypes 11 in the eye test optotype 10 is a predetermined size. According to this embodiment, the visibility of the optotype 11 is not affected by the size of the optotype 11, but is affected by the color difference between the background portion 12 and the inside 15 of the optotype, and the outline portion 14. Therefore, the eye test optotype 10 according to this embodiment can provide an optotype whose visibility is not affected by the size of the optotype 11 during testing.

Furthermore, according to the above-described embodiment, the eye examination device includes a first acquisition unit 31 that acquires instruction information II including information regarding an instruction to start a test using the above-described eye examination target 10, and a first presentation unit 33 that presents the eye examination target 10 to the subject 1 according to the instruction information II acquired by the first acquisition unit 31. According to this embodiment, the eye examination device can display to the subject 1 a specified eye examination target 10 from the eye examination targets 10 stored in the server device 21. Therefore, the eye examination device according to this embodiment can provide the eye examination target 10 that is an eye examination target that makes it easy for the subject 1 to realize an improvement in the visual cognitive function.

Furthermore, according to the above-described embodiment, the eye examination device further includes a second acquisition unit 41 that acquires visual information VI, which is the color difference between the color of the outline portion 14 and the color of the background portion 12 of the optotype 11 that the subject 1 can see, an identification unit 42 that identifies visual information EI, which is information on the visual cognitive function of the subject 1, based on the visual information VI acquired by the second acquisition unit 41, and a second presentation unit 43 that presents the identified visual information EI to the subject 1 or an examiner. Therefore, the eye examination device according to this embodiment can measure the visual cognitive function of the subject 1 based on the optotype 11 that the subject 1 can see in the eye examination optotype 10.

Furthermore, according to the above-described embodiment, the eye examination device further includes a search unit 51 that searches for eyeglasses information GI, which is information about eyeglasses 2 that improve the visual cognitive function of the subject 1, based on the visual information VI acquired by the second acquisition unit 41, and a third presentation unit 52 that presents the searched eyeglasses information GI to the subject 1 or the examiner. Therefore, the eye examination device according to this embodiment can display information about eyeglasses 2 that improve the visual cognitive function of the subject 1 to the subject 1, based on the optotype 11 that the subject 1 can visually recognize.

In addition, all or part of the functions of each part of the eye test target 10, eye test target 10A, and eye test target 10B in the above-mentioned embodiment may be realized by recording a program for realizing these functions on a computer-readable recording medium, and reading and executing the program recorded on the recording medium into a computer system. Note that the "computer system" here includes hardware such as the OS and peripheral devices.

"Computer-readable recording media" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as recording units such as hard disks built into computer systems. Furthermore, "computer-readable recording media" may include those that dynamically store a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and those that store a program for a certain period of time, such as volatile memory within a computer system that serves as a server or client in such cases. The above-mentioned program may also be one that realizes some of the functions described above, or may be one that can realize the functions described above in combination with a program already recorded in the computer system.

Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to the above, and various design changes can be made without departing from the spirit of the present invention. In addition, the configurations described in the above-mentioned embodiments and examples may be combined.

1...Subject, 2...Glasses, 10...Eye test target, 11...Target, 12...Background, 13...Optical specimen, 14...Contour, 15...Inside target, 16...Color difference information, DR1...First direction, DR2...Second direction, 3...System, 20...Terminal device, 21...Server device, II...Instruction information, NW...Network, OI...Target information, 31...First acquisition unit, 32...Control unit, 33...First presentation unit, CI...Control information, 41...Second acquisition unit, 42...Identification unit, 43...Second presentation unit, VI...Visual information, EI...Visual information, 51...Search unit, 52...Third presentation unit, GI...Glasses information

Claims (16)

An eye test target having a plurality of targets as components,
The target is
A contour portion having a predetermined line width that separates a background portion and a visual specimen body in the visual target, and an inside of the visual target having a predetermined area enclosed by the contour portion;
As a component,
An eye test target in which visibility is varied by varying a color difference between a background portion and an inside of the target and the outline portion. The color of the background portion of the plurality of targets is constant;
The eye test target according to claim 1 , wherein the colors of the outlines of the plurality of targets are different from each other, thereby making the visibility different. The color of the outlines of the plurality of targets is constant;
The eye test target according to claim 1 , wherein the colors of the background portions of the plurality of targets are different from each other, thereby making the visibility different. The eye test target according to claim 1 , wherein a pixel value of a contour portion of the target and a pixel value of the background portion differ from each other by a predetermined value or more. The plurality of targets include
The color of the background portion of the plurality of targets is constant;
The visual target is arranged in a first direction so that the color of the outline portion constituting the visual target is constant;
5. The eye test target according to claim 1, wherein the contours of the plurality of targets are arranged in different colors in a second direction intersecting the first direction such that the visibility of the targets decreases in sequence as the target advances in the second direction. The eye test target according to claim 1 , wherein the target is a grayscale target. The eye test target according to claim 1 , wherein a color of the outline portion and a color of the background portion of the target are similar colors. 5. The eye test target according to claim 1, wherein the predetermined line width of the contour portion is equal to or greater than 0.25 points and less than 1.5 points when the subject views the target from a distance of 10 cm to 40 cm. 5. The eye test target according to claim 1, wherein color difference information including at least one of a value corresponding to a target color difference, which is a color difference between a color of the outline portion of the target and a color of the background portion, or a number assigned to the target, is written at a position corresponding to the target. The eye test target according to claim 1 , wherein the character sizes of the plurality of targets are predetermined. A first acquisition unit that acquires an instruction to start an examination using the eye test target according to any one of claims 1 to 4;
a first presenting unit that presents the eye test target to a subject in accordance with the instruction acquired by the first acquiring unit;
An optometric apparatus comprising: A second acquisition unit that acquires visual recognition information that is a color difference between a color of a contour portion of the visual target visually recognized by the subject and a color of a background portion of the visual target;
An identification unit that identifies visual information, which is information on the visual cognitive function of the subject, based on the visual information acquired by the second acquisition unit;
A second presentation unit that presents the identified visual information to the subject or an examiner;
The optometric apparatus according to claim 11 , further comprising: a search unit that searches for glasses information that is information on glasses that improve a visual cognitive function of the subject based on the visual recognition information acquired by the second acquisition unit;
a third presentation unit that presents the searched eyeglasses information to the subject or the examiner;
The optometric device according to claim 12 , further comprising: On the computer,
A first acquisition step of acquiring an instruction to start an examination using the eye test target according to any one of claims 1 to 3;
a first presenting step of presenting the eye test target to a subject in accordance with the instruction acquired in the first obtaining step;
A program that executes the following. a second acquisition step of acquiring visual information, which is a color difference between a color of a contour portion of the visual target visually recognized by the subject and a color of a background portion;
A step of identifying visual information, which is information on the visual cognitive function of the subject, based on the visual information acquired by the second acquisition step;
a second presentation step of presenting the identified visual information to the subject or an examiner;
The program according to claim 14, further comprising: a searching step of searching for glasses information, which is information on glasses that improves the visual cognitive function of the subject, based on the visual information acquired by the second acquiring step;
a third presentation step of presenting the searched eyeglasses information to the subject or the examiner;
The program according to claim 15, further comprising:

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