CN111904375A - Visual chart for self-test and use method thereof - Google Patents

Abstract

The invention provides an eye chart for self-test and a using method thereof, wherein an E-shaped sighting target in the eye chart adopts a square with equal length of three strokes and adopts a high-pass resolution design, and the boundary is as follows: the core is as follows: boundary 1:2:1, average luminance of E-letter (black core and white border) matches luminance of gray background, contrast: 100%, using an intelligent terminal such as a mobile phone and the like during self-test, wherein each test displays 5 visual targets in one row, and the visual target interval of each row is one visual target width of the row, which is from LogMAR 1.0 to logMAR-0.3, and is totally 14 rows. The test method comprises the following steps: s1, starting from the first line, extracting 1 visual target per line for answering, S2, entering the next line if the answer is correct, S3, answering wrongly, returning to the previous line, and enabling the visual target of the whole line to appear, and S4, entering the next line if the answer is wrong at 1; if the answer has 2 or 3 errors, go to the previous row; 4 or more errors occurred, and the test was terminated.

Description

Visual chart for self-test and use method thereof

Technical Field

The invention relates to the field of detection, in particular to an eye chart for self-detection and a using method thereof.

Background

The current vision test mainly adopts a vision test chart, the sight line of a person to be tested is parallel to one line of 1.0 and is 5 meters away from the vision test chart, the distance between the vision test chart and the person to be tested is required to be correctly fixed, and the distance between a patient and the vision test chart is 5 meters. If the indoor distance is less than 5 m long, a plane mirror is placed at 2.5 m to reflect the visual chart. The detection is carried out by covering one eye, and the direction of the E-shaped gap is recognized by one eye from top to bottom until the E-shaped gap cannot be recognized, and then the E-shaped gap is recorded. Normal vision should be above 1.0. If the subject cannot see 0.1, the subject should move forward until the subject can see 0.1, and the vision is "0.1 × distance/5 ═ vision"; if the index is not 0.1 within half a meter, the tester can recognize the index and test the hand feeling, the light feeling, etc. The vision was recorded according to the examination. The multipurpose J-shaped near vision chart for near vision recognizes the direction of the E-shaped gap by the same method until the gap can not be recognized, can be automatically adjusted at a short distance, and can be used for 1.0 line of normal near vision at a position of 30 cm, so that the near vision examination is favorable for diagnosis of ametropia.

Currently, most of the vision tests need to be measured in a proper environment and cannot be controlled by testers, so that unnecessary troubles are caused.

Disclosure of Invention

The invention aims to realize the visual function self-test anytime and anywhere.

In order to achieve the above object, the present invention provides an eye chart for self-test and a method for using the same, the eye chart for self-test, an "E" shaped sighting mark in the eye chart, which adopts a square with three strokes and equal length, and adopts a high-pass resolution design, and the boundary: the core is as follows: the average intensity of the E-letter matches the intensity of the gray background, with the boundary 1:2: 1.

Preferably, the average brightness is the average brightness of the black core and the white frame.

Preferably, the brightness matching is 100% contrast.

Preferably, the self-test adopts an intelligent terminal, and 3-7E-shaped sighting marks are displayed on the terminal at one time.

Preferably, each sighting mark interval is one sighting mark width of the line.

Preferably, the eye chart is from LogMAR 1.0 to logMAR-0.3, for 14 rows, one row being displayed for each test.

Further provides a vision self-test method, which uses the visual chart for self-test, and the specific test steps are as follows:

s1, starting from the first line, extracting 1 visual target per line to answer

S2, entering the next line if the answer is correct

S3, answering the mistake, returning to the previous line, displaying a whole line of sighting marks,

s4, if the answer is wrong at 1 position, entering the next line; if the answer has 2 or 3 errors, go to the previous row; 4 or more errors occurred, and the test was terminated.

Preferably, 3-7E-shaped sighting marks are extracted at the same level from the first row at a time, and the E-shaped sighting marks needing to point out the direction are marked.

The invention has the following beneficial effects:

1. the invention provides a vision self-testing method based on an intelligent terminal.

2. The E-shaped sighting target adopted by the invention has a reasonable structure, and simulates the vision test under natural light, so that a tester can not cause different test results due to the brightness of the screen.

Drawings

FIG. 1 is a schematic diagram of high-pass resolution E-word optotype spacing.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the embodiments described are only some representative embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

EXAMPLE 1 Vision test

As shown in FIG. 1, an eye chart for self-test and its method of use are provided, in which the "E" shaped optotype is a square of equal length in three strokes, and a high-pass resolution design is used, with boundaries: the core is as follows: boundary 1:2:1, average luminance of E-letter (black core and white border) matches luminance of gray background, contrast: 100%, using an intelligent terminal such as a mobile phone and the like during self-test, wherein each test displays 3 visual targets in one row, and the visual target interval of each row is one visual target width of the row, and the total number of the visual targets is 14 rows from LogMAR 1.0 to logMAR-0.3. The test method comprises the following steps:

s1, starting from the first line, extracting 1 visual target per line to answer

S2, entering the next line if the answer is correct

S3, answering the mistake, returning to the previous line, displaying a whole line of sighting marks,

s4, if the answer is wrong at 1 position, entering the next line; if the answer has 2 or 3 errors, go to the previous row; 4 or more errors occurred, and the test was terminated.

The subject is asked to identify any optotype in each line, and if correct, the identification of any optotype in the next line is entered, and if wrong, the test returns to the entire line of optotypes in the previous line. At this time, if more than or equal to 2 errors occur, the whole previous line of visual targets is tested again until only the line with less than or equal to 1 error occurs, and a standard line vision detection program is started from the line, namely, the subject is required to identify each letter of each line until 4 letters of the whole line are identified by error or the visual targets of the last line of the visual chart are identified more than or equal to 4 correctly, at this moment, the test is terminated, and the vision result is calculated.

And scoring according to the number of the visual targets correctly identified by the testee. Since the rows differ by 0.1logMAR, and there are 5 optotypes per row, each optotype accounts for 0.02logMAR on average. Therefore, the vision score is calculated by the following equation:

VA＝1.1-N×0.02

where N represents the number of optotypes of the read pair.

The lower the score, the better the vision.

EXAMPLE 2 Vision test

An eye chart for self-test and its application method are provided, in which the visual target of E shape is a square with three strokes and equal length, and high-pass resolution design is adopted, and the boundary is: the core is as follows: boundary 1:2:1, average luminance of E-letter (black core and white border) matches luminance of gray background, contrast: 100%, using an intelligent terminal such as a mobile phone and the like during self-test, wherein each test displays 5 visual targets in one row, and the visual target interval of each row is one visual target width of the row, which is from LogMAR 1.0 to logMAR-0.3, and is totally 14 rows. The test method comprises the following steps:

s1, starting from the first row, sequentially answering 5 sighting marks.

S2, entering the next line if the answer is correct

S3, answering the mistake, returning to the previous line, displaying a whole line of sighting marks,

s4, if the answer is wrong at 1 position, entering the next line; if the answer has 2 or 3 errors, go to the previous row; 4 or more errors occurred, and the test was terminated.

The subject is asked to recognize each letter in each row until either 4 letters in an entire row are recognized by mistake or the optotype in the last row of the chart is recognized correctly by 4 or more, at which point the test is terminated and the vision result is calculated.

And scoring according to the number of the visual targets correctly identified by the testee. Since the rows differ by 0.1logMAR, and there are 5 optotypes per row, each optotype accounts for 0.02logMAR on average. Therefore, the vision score is calculated by the following equation:

VA＝1.1-N×0.02

where N represents the number of optotypes of the read pair.

The lower the score, the better the vision.

Start interface setup

Gamma value filling interface

2. Contrast fill interface

Contrast is defined by Michelson Contrast, and the formula is

With such a start interface, an initial contrast can be optimized.

Various modifications may be made to the above without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is therefore intended to be limited not by the above description, but rather by the scope of the appended claims.

Claims (8)

1. An eye chart for self-test, wherein the visual target of the E shape in the eye chart adopts a square with equal length of three strokes, and adopts a high-pass resolution design, and the boundary is as follows: the core is as follows: the average intensity of the E-letter matches the intensity of the gray background, with the boundary 1:2: 1.

2. The eye chart of claim 1, wherein the average brightness is the average of the brightness of the black core and the white border.

3. The eye chart for self-testing according to claim 2, wherein the brightness match is a contrast of 100%.

4. The visual acuity chart for self-testing according to claim 1, characterized in that the self-testing adopts an intelligent terminal, and 3-7E-shaped visual targets are displayed on the terminal at one time.

5. The eye chart for self-testing according to claim 4, wherein each optotype spacing is one optotype width for the row.

6. The eye chart of claim 5, wherein the eye chart comprises 14 rows from LogMAR 1.0 to logMAR-0.3, one row for each test.

7. A method for self-testing vision, characterized in that, using the visual chart for self-testing according to any one of claims 1-6, the specific testing steps are as follows:

s1, starting from the first line, extracting 1 visual target per line to answer

S2, entering the next line if the answer is correct

S3, answering the mistake, returning to the previous line, displaying a whole line of sighting marks,

s4, if the answer is wrong at 1 position, entering the next line; if the answer has 2 or 3 errors, go to the previous row; 4 or more errors occurred, and the test was terminated.

8. The method for self-testing eyesight of claim 7, wherein 3-7E-shaped targets are extracted from the first row at the same level each time, and the E-shaped targets with the required directions are marked.

Images