Eye chart and method of use thereof

Abstract

The invention discloses a visual chart and a using method thereof. The visual chart comprises a visual chart body with visual targets and a plurality of shielding parts, wherein each shielding part has a structure with a plurality of perspective parts; when the shielding parts are arranged in front of the visual chart body, the positions of the perspective parts correspond with those of visual targets on the visual chart body one to one, the visible part, seen through the perspective part, of the visual target is the direction visual target, and different direction visual targets are formed when different shielding parts are arranged in front of the visual targets. According to the using method, one visual chart with different shielding parts can be used for displaying a plurality of different direction visual targets, can form multiple testing scheme, can avoid cheating of tested persons, and has low cost in comparison with application of multiple visual charts.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an eye chart and a using method thereof. Background technique [0002] In real life, people must often measure their eyesight, that is, people measure their eyesight by observing the up, down, left, and right directions of the gaps of the E-shaped gaps on the eye chart a few meters in front of the eye chart; If the subject suffers from myopia, for example, the subject memorizes the opening direction of each row of each letter E on the eye chart in advance, which will inevitably affect the authenticity of the measured vision. A patented eye chart (CN102715885A) provides a vision card with revolving shafts. The eye chart can be adjusted by rotating the direction of each revolving shaft to prevent cheating, but the tester needs to rotate each revolving shaft in advance to ensure the accuracy of the test. sex, time-consuming and labor-intensive, and inconvenient ...

AI Technical Summary

Problems solved by technology

[0002] In real life, people must often measure their eyesight, that is, people measure their eyesight by observing the up, down, left, and right directions of the gaps of the E-shaped gaps on the eye chart a few meters in front of the eye chart; If you suffer from myopia yourself, for example, the subject memorizes the opening direction of each row of E on the eye chart in advance, which will inevitably affect the authenticity of the measured vision

A patented eye chart (CN102715885A) provides a vision card with revolving shafts. The eye chart is adjusted by rotating the direction of each revolving shaft to prevent cheating. However, the tester needs to rotate each revolving shaft in advance to ensure the accuracy of the test. sex, time-consuming and labor-intensive, and inconvenient to use

Images