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Visual function self-testing method

A technology of visual function and self-test, applied in the field of visual function self-test, it can solve the problems of inability to detect, high labor cost, difficult to describe, etc., and achieve the effect of fast speed and accurate test results.

Active Publication Date: 2020-06-09
ZHONGSHAN OPHTHALMIC CENT SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clinically, the loss of stereopsis is something many patients cannot perceive on their own and are difficult to describe
[0005] Visual function is divided into light vision, color vision, shape perception (sight), kinesthesia (stereoscopic vision) and contrast vision (contrast sensitivity). At present, visual function tests can only be completed accurately under the guidance of professionals, and cannot be performed alone. It is inconvenient to carry out visual function test, the visual function test process is more complicated and the labor cost is high, but it is not convenient enough, and it cannot be tested when needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 visual acuity test

[0039] Step 1. Input the information of the person to be tested

[0040] figure 1 As shown, the information filling interface of S1.

[0041] This interface contains input boxes for name, age, and contact information. After the subject enters the information in the correct format, the information of the subject will be saved and jump to the distance measurement debugging interface.

[0042] Step 2. Distance test and gaze direction test

[0043] Distance test:

[0044] The actual distance is obtained by combining the interfaces in the two frameworks of SceneKit and ARKit.

[0045] SceneKit will obtain the user's facial information based on the iPhone X's front camera, construct a scene and establish a coordinate system based on the information obtained by the camera in real time. The world coordinate system established by SceneKit is a three-dimensional coordinate system with the front camera of the iPhone X as the origin, the direc...

Embodiment 2

[0076] Embodiment 2 contrast sensitivity test

[0077] The test steps are the same as the eyesight test steps of Example 1, but the test content adopted is different.

[0078] 1. Test environment and visual stimulus design

[0079] 1) Test environment

[0080] The user places the mobile phone horizontally, and in a dark room environment, simulates a visual target size equivalent to 50cm for testing (the simulation method adopted is the same as that of Embodiment 1). Test the right eye first, then the left eye. The non-test eye is completely covered with a goggle or palm.

[0081] 2) Visual stimulation design

[0082] Visual stimuli consisted of vertical or horizontal gratings (Gabor). On different trials, the grating's spatial frequency and contrast values ​​were automatically generated based on the test results of the subject's previous trials.

[0083] 2. Test process and threshold setting

[0084] 1) Practice and familiarize yourself with the test process: the subjec...

Embodiment 3

[0086] Embodiment 3 Stereo vision test

[0087] The test steps are the same as the eyesight test steps of Example 1, but the test content adopted is different.

[0088] 1. Test environment and visual stimulus design

[0089] 1) Environmental requirements

[0090] The user places the mobile phone horizontally, and uses the red and green three-dimensional lenses to simulate the size of the visual mark equivalent to 50cm under natural light for testing (the simulation method adopted is the same as that of Example 1).

[0091] 2) Visual stimulation design

[0092] The stimuli were two static random spots in the shape of disks placed side by side on a dark background, and the edges of the disks were Gaussian blurred to avoid edge effects causing parallax. Each disk contains randomly positioned red and green dots with a certain offset between them to create a sense of depth, as in Figure 6 .

[0093] Using the blending function provided by OpenGL ES, the overlapping red and gr...

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Abstract

The invention discloses a visual function self-testing method. The method comprises the following steps: using a mobile phone with 3D structured light and a camera for carrying out self-test on a visual function; using the camera for detecting distances from the eyes to the screen; simulating a visual function detection scene on a screen of a mobile phone by utilizing the distances, displaying sighting marks with proper sizes on the screen according to different distances, carrying out eye movement tracking by utilizing 3D structured light and the camera, detecting eyeball movement by utilizing the eye movement tracking, and carrying out self-test response by utilizing the eyeball movement. According to the method, face recognition, eyeball tracking and automatic distance measurement are creatively combined, the self-test of the visual function is achieved, the situation that visual function detection needs assistance of other people and testing can only be conducted in a professionalenvironment is changed, the testing accuracy is greatly improved, and personal errors are reduced. According to the method, the sighting mark size is adjusted by combining a minimum resolution visualangle and the actual distance from the eyes to the screen, so that the self-test of the visual function is realized, and the test result is automatically displayed.

Description

technical field [0001] The invention relates to the detection field, in particular to a visual function self-test method. Background technique [0002] The current visual acuity test mainly uses a visual acuity test chart. The line of sight of the subject should be parallel to the line of 1.0, 5 meters away from the visual chart. If the indoor distance is less than 5 meters long, a plane mirror should be placed at 2.5 meters to reflect the eye chart. Cover one eye for detection, and identify the direction of the "E" gap from top to bottom with one eye until it is unrecognizable, and record it. Normal vision should be above 1.0. If the subject can't see 0.1, he should move forward until he can see 0.1, his vision is "0.1×distance / 5=vision"; if he still can't see 0.1 within half a meter, he can make the subject The tester recognizes the index, measures manual, light perception, etc. Visual acuity was recorded by inspection. For near vision, use the "J" near vision chart. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/02A61B3/032A61B3/113A61B3/14A61B3/15
CPCA61B3/02A61B3/113A61B3/14A61B3/15A61B3/0325Y02D30/70
Inventor 余敏斌成慧赖秀娜文芸孔阳刘子田陈子东
Owner ZHONGSHAN OPHTHALMIC CENT SUN YAT SEN UNIV
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