RU107936U1 - DEVICE FOR DETERMINING CHANGES IN COLOR VISION - Google Patents

Abstract

 A device for determining a color vision change, comprising a test object generator, a display, a control device and an image parameter setting unit, the second output of the control device being connected to a control input of a test object generator, an output of an image parameter setting unit connected to a display input, and a control input the image parameter setting unit is connected to the first output of the control device, characterized in that an interrupt module is introduced into the device, the input of which is connected to Exit generator test objects, the output is connected to an information input unit establishing the parameters of the image, and a control input coupled to the third output of the control device; at the same time, the patient is presented with a flashing image of the test object against a constant background, and the information value of the test object is linearly and unambiguously related to the difference in color saturation of the test object and background along the previously selected direction in the color space.

Description

The utility model relates to the field of ophthalmology and can be used in the study of acquired color vision disorders.

A device for studying color perception, made in the form of a display test, (Clinical Physiology of Vision: Essays / Ed. AM Shamshinova - M .: TM Andreeva, 2006, p. 313), is freely available on the Internet at: http://colorvisiontesting.com/. During testing, test objects are displayed on the computer screen, in the vast majority of which are similar to those in polychromatic tables printed in a typographic manner. The test subject is asked to determine what he sees on the screen and compare with the correct answer. In fact, the images of tables made by the printing method are simply transferred to the computer screen. The disadvantages of such a device are:

- the complexity of the application in medical practice, because Requires a computer connected to the Internet via a high-speed connection;

- the presence of only strictly defined sets of test objects with predetermined strictly defined color shades, which makes it possible for the patient to guess the correct answers;

- limiting the accuracy of determining the parameters of color vision with a strictly defined set of color shades.

Closest to the claimed device is a device for checking visual acuity according to the patent of the Russian Federation for utility model No. 78665, containing a generator of test objects, a display, a device for setting image parameters and a control device. When the device is in operation, image parameters are set with the possibility of simultaneous or sequential changes in the size, shape, orientation, color and color saturation of test objects and the background image in a wide dynamic range.

The disadvantage of this device is:

- the difficulty of independent use of the device by the patient, especially when detecting minor acquired color vision disorders.

Effect: improving the accuracy of assessing color vision disorders, including when the patient conducts self-control of his vision.

The technical result is achieved by the fact that in the device for checking visual acuity (RF patent for utility model No. 78665), containing a test object generator, a display, a control device and an image parameter setting unit, the second output of the control device being connected to the first input of the test generator objects, the output of the block for setting the image parameters is connected to the display input, and the control input of this block is connected to the first output of the control device, an interrupt module is introduced, the input of which is connected to the output generator of test objects, the output is connected to the first information input of the image parameter setting unit, and the control input is connected to the third output of the control device.

The proposed device is illustrated by drawings of figures 1-3:

Figure 1 is a block diagram of a device.

Figure 2 is a view of the color field of an available display palette with a central area of "color discrimination" and highlighted characteristic lines of color disturbance: "blue - yellow" (solid line) and "red - green" (dashed line).

Figure 3 - change in the difference in color saturation of the test object and the background on the selected line "blue - yellow" (suspected glaucoma). For clarity, significant differences were found in the colors of the test object and background.

A device for detecting color vision disorders (Figure 1), contains a display 1, the input of which is connected to the output of the image parameter setting device 2. The information input of the image parameter setting device 2 is connected to the output of the interrupt module 5. The control input of the device 2 is connected to the first output of the device control 4. The second output of the control device 4 is connected to the control input of the test object generator 3. The output of the test object generator 3 is connected to the input of the interrupt module 5, the control input of which th connected to the third output of the control device 4.

The test object is performed in the form of stylized numbers, the information value of which is linearly and unambiguously associated with the difference in the color saturation of the background and the test object, i.e., with the distance on the display palette between the background color point and the color point of the test object on the selected line of color perception violation.

The proposed device operates as follows.

The test object generator 3 through the interrupt module 5 and the image parameter setting unit 2 transmits images of the test objects and background to the display 1. The control device 4 acts on the image parameter setting unit 2 through its control input. The control device 4 through its second output controls the operating mode of the generator of test objects 3, and through the third output - the interrupt module 5.

The interrupt module (Figure 1, item 5) is a special electronic or optical device (the specific principle of operation is not fundamental), the purpose of which is to generate an intermittent (blinking) image of the test object against a constant display background. When the device is operating, the information value of the projected test object is linearly and unambiguously related to the difference in the characteristics of the color saturation of the image and background along the selected line of color perception disturbance.

Work with the device as follows.

The alleged line of color disturbance is selected on the display palette (“color space” - Figure 2) (M. Formankievich. Acquired color vision disorders. Modern optometry, 2010, No. 5 (35), p.23). The patient is presented with a blinking image of a digital test object having the color of one end of this line against a background having the color of the other end of this line (for example, a “blue-yellow" line - Figure 3). The test object is presented in the form of stylized numbers, while the digital value of the test object is proportional to the distance between the points on the selected line of color perception disturbance. Gradually reducing the “color distance” (symmetrically shifting the points to the center of the palette) between the test object and the background, the minimum value of the test object’s number is fixed, at which the patient stably sees a blinking image. Comparison of the obtained values with the control data obtained from people with normal color perception gives an idea of the existence and degree of color vision impairment.

Using the proposed device can improve the accuracy of the assessment of color perception during the patient’s self-monitoring.

In addition to carrying out routine procedures for self-vision, the conduct of such studies with increased accuracy is very important in training specialists with professional vision (military personnel, sailors, pilots, transporters, etc.) and in the early diagnosis of some ophthalmic diseases. For example, when testing for distinguishing between yellow and blue light, early signs of glaucoma can be detected (M. Formankievich. Acquired color vision disorders. Modern optometry, 2010, No. 5 (35), p. 25, and also Clinical physiology of vision: Essays / Edited by AM Shamshinova - M .: T.M. Andreeva, 2006, p. 323, 350).

In addition to the lines of color perception disturbance highlighted and mentioned in the description, if there is a medical justification, it is possible to use any arbitrarily defined directions in the color space (palette), including unipolar ones, designed to determine the color perception threshold. In this case, the background color is chosen equal to the color of the point in the center of the color space.

Claims (1)

A device for determining a color vision change, comprising a test object generator, a display, a control device and an image parameter setting unit, the second output of the control device being connected to a control input of a test object generator, an output of an image parameter setting unit connected to a display input, and a control input the image parameter setting unit is connected to the first output of the control device, characterized in that an interrupt module is introduced into the device, the input of which is connected to Exit generator test objects, the output is connected to an information input unit establishing the parameters of the image, and a control input coupled to the third output of the control device; at the same time, the patient is presented with a blinking image of the test object against a constant background, and the information value of the test object is linearly and unambiguously related to the difference in color saturation of the test object and the background along the previously selected direction in the color space.