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A visual inspection device

A test device and vision technology, which is applied in medical science, diagnosis, eye test equipment, etc., can solve the problems of large error in low vision test and difficulty in judging the authenticity of vision test results, so as to improve the accuracy rate and test accuracy rate Effect

Active Publication Date: 2021-08-03
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a vision testing device for the above-mentioned deficiencies in the existing vision testing process, such as the difficulty in judging the authenticity of the vision test results and the large error of the low vision test.

Method used

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  • A visual inspection device
  • A visual inspection device
  • A visual inspection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: see figure 1 , a heterogeneous visual acuity chart, in the heterogeneous visual acuity chart, it includes 2 kinds of visual targets with different sizes and a perspective view that affects the visual depth of different sizes of visual targets, and the first type of visual targets includes 5 small-sized visual targets Optotypes, the second type of optotypes include 5 large-sized optotypes, and the first type of optotypes and the second type of optotypes are placed in different positions. The perspective view includes a first line A, a second line B and a third line C, several first lines A are concentrated to one point along the depth direction, and several second lines B parallel to each other are parallel to the first line in the horizontal direction The grid pattern formed by the intersection of A forms a horizontal plane, and several parallel third lines C intersect with the first line A in the vertical direction to form a number of grid figures arrang...

Embodiment 2

[0049] Example 2: see figure 2, a heterogeneous vision chart, in the heterogeneous vision chart, it includes 2 kinds of optotypes with different sizes, a perspective view that affects the visual depth of the different sizes of the optotypes, and 2 E-word optotype graphics composed of lines , the first type of optotype includes 5 small-sized optotypes, the second type of optotype includes 5 large-sized optotypes, and the first type of optotype and the second type of optotype are placed in different positions. The structure of the perspective view is the same as that of Embodiment 1. Among the two E-word optotype graphics, the size of one E-word optotype graphic is not greater than 0.5 times that of the first type of optotype, and the size of the other E-word optotype graphic is not less than 1.5 times that of the second type of optotype. Specifically, the upper right area of ​​the heterogeneous visual acuity chart is the first type of optotype, among the five optotypes, the f...

Embodiment 3

[0050] Embodiment 3: see image 3 , a heterogeneous visual acuity chart, in the heterogeneous visual acuity chart, including two kinds of optotypes of different sizes, a perspective view that affects the visual depth of different sizes of optotypes, and four E-word optotype graphics composed of lines , the first type of optotype includes 5 small-sized optotypes, the second type of optotype includes 5 large-sized optotypes, the 2 types of optotypes are divided into 2 groups, and the first group of optotypes includes 4 first-type optotypes The second group of optotypes includes one second type of optotype and four first type of optotypes, and the optotypes of the first group and the second group are placed in different places. s position. Among the 4 E-word optotype graphics, there are 2 small E-word optotype graphics of the same size and 2 large E-word optotype graphics of the same size, and the size of the small E-word optotype graphics is not larger than that of the first ty...

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Abstract

The invention discloses a vision testing device, which comprises a distance measuring device, a vision chart installation and adjustment device and a vision chart support device. The vision chart installation and adjustment device is fixed on the vision chart support device, and is used for changing and displaying different vision charts, The measuring device is used for measuring the distance between the inspected person and the eye chart to be tested, and the eye chart or its image in the mirror is the eye chart to be tested. When performing visual acuity testing, use different visual acuity charts alternately for testing, and when using heterogeneous visual acuity charts and single visual acuity charts for testing, change the testing distance between the person being tested and the visual acuity chart to obtain the best result for the person being tested. Visual acuity, according to different visual acuity charts and the visual acuity difference between various visual acuity test results, it can be judged whether the visual acuity tested by the standard logarithmic visual acuity chart is real vision, which can effectively detect fake vision.

Description

technical field [0001] The invention belongs to the technical field of vision detection, and in particular relates to a device for vision detection. Background technique [0002] Vision is one of the commonly used indicators of human body function status. In my country, the "GB 11533 Standard Logarithmic Vision Chart" is usually used to test vision. However, in the process of vision testing, the main problems are: [0003] (1) The test results of visual acuity depend on subjective cooperation and narration, which may be untrue. Tested by a conventional eye chart, the standard test distance is 5 meters, and more than half of the smallest visual marks that can be correctly identified are visual acuity. Since the test process is highly dependent on subjective cooperation and the main statement, and the direction and order of the various vision targets in the eye chart are fixed, when the main statement is not true, the test results cannot reflect the real vision. For example,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/032
CPCA61B3/032
Inventor 汪岚苑一祥苑志岷
Owner QINGDAO UNIV
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