Visual chart for self-testing and using method thereof

Abstract

The invention provides a visual chart for self-test and a using method thereof. An E-shaped sighting mark in the visual chart adopts three squares with equal length, and a high-pass resolution designis adopted; the ratio of a boundary to a core to a boundary is 1:2:1, the average brightness (the black core and a white frame) of a letter E is matched with the brightness of a gray background, and the contrast ratio is 100%; during self-testing, an intelligent terminal such as a mobile phone is used; and five sighting marks in one row are displayed in each testing, the distance between the sighting marks in each row is the width of one sighting mark in the row, and the 14 rows of sighting marks are arranged from LogMAR 1.0 to logMAR-0.3. A testing method comprises the following steps of: S1,starting from the first row, extracting one sighting mark from each row for answering; S2, entering the next row if an answer is correct; S3, if the answer is wrong, returning to the previous row andgenerating the whole row of sighting marks; and S4, entering the next row if one error occurs in the answer, entering the previous row if two or three errors occur in the answer, and ending the testing when four or more errors occur.

Description

technical field [0001] The invention relates to the detection field, and more specifically, to an eye chart for self-test and a method for using the same. 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...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the vision tests need to be measured in a suitable environment, which cannot be controlled by the tester himself, so it will cause a lot of unnecessary troubles

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