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Special visual chart lightbox and application method thereof

An application method and technology of eye chart, applied in the field of medical devices, can solve problems such as inaccurate test results, wrong results, wrong judgments of the examinee, etc., and achieve the effect of accurate test results

Pending Publication Date: 2020-05-29
明灏科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When conducting the red-green test, the examinee is to distinguish which color is clear, and the result is only "yes" or "no" answered by the examinee, that is, the test results are completely based on subjective feelings and personal language expressions. Children or adult subjects who lack expressive ability can easily cause errors in the results. Even for ordinary subjects, when the clarity of the red and green optotypes is close, it is easy to cause the subjects to make mistakes in judgment. During the red-green test, there are many uncontrollable interference factors, and the test results are not accurate enough. There is an urgent need for a test inspection method that can quantify the clarity and accurately judge the red-green test results.

Method used

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  • Special visual chart lightbox and application method thereof
  • Special visual chart lightbox and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The embodiment of the present invention relates to a special-purpose eye chart light box, which includes a display panel 4, an eye chart is arranged on the panel, the panel can transmit light, and a background light is arranged inside the panel, and the colors of the background light are red and green. , yellow and white, the light box is provided with a control unit, the control unit is used to receive the control signal and control the luminous color of the background light, wherein:

[0066] The red background visual acuity chart is used to judge the undercorrected state of the subject's refractive correction;

[0067] The green background eye chart is used to judge the overcorrection state of the subject's refractive correction;

[0068] The yellow background visual acuity chart is used in the clinical optometry process of the examinee, for the reference of naked eye or refractive corrected visual acuity test, uncorrected visual acuity, and red and green visual acui...

Embodiment 2

[0087] The special-purpose eye chart light box provided by the present invention is based on a logarithmic eye chart or an international logarithmic eye chart or a Lange ring eye chart, and can remotely select the color of the background light: red, green, yellow or white, for judging the The examiner depends on the clarity of the red and green background color, and the application method specifically includes the following steps:

[0088] (1) Under the white background light, MPMVA is detected by the traditional optometry method, and the optometry insert is inserted according to the MPMVA result, and the minimum visual acuity line that can completely and correctly interpret the entire line is recorded, usually 1.0 or 1.2;

[0089] (2) Cover the left eye and check the right eye;

[0090] (3) Under the red background light, the subject stares at the special eye chart light box, interprets the minimum visual acuity line and the next line of the minimum visual acuity line, and re...

Embodiment 3

[0100] Taking a subject as an example, the steps are as follows:

[0101] 1. The background light of the special eye chart light box is adjusted to white, which is used as a vision inspection tool for traditional optometry until MPMVA is detected;

[0102] 2. The result of MPMVA is:

[0103] Right eye: -2.20DS&-1.00DC*175, left eye: -2.10DS&-1.00DC*175;

[0104] 3. After fine-tuning the axial position and degree of the cylinder, the result remains unchanged, and the left eye is covered to check the right eye;

[0105] 4. Correctly interpret the comparison of the number of visual targets in each line:

[0106] (1) Instruct the subject to look at the special eye chart light box (red background), for the white background, the minimum visual acuity line 1.0 of the entire line and the next line 1.2 can be completely and correctly interpreted, and the number of visual targets Ra1, Ra1, and Ra2;

[0107] (2) Instruct the subject to look at the special eye chart light box (green b...

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Abstract

The invention provides a special visual chart lightbox. The special visual chart lightbox comprises a display panel, wherein a visual chart is arranged on the panel; background lights are arranged inthe panel and include a red background light and a green background light; a control unit is arranged in the lightbox and is used for receiving a control signal and controlling lighting colors of thebackground lights. When the special visual chart lightbox is matched with a specific examination method, the subjective feeling of an examinee can be quantized with numbers, the examination results can be precisely compared, and misjudgment on clear degrees of different background sighting marks caused by subjective feeling and individual verbal expression can be avoided.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a special eye chart light box and an application method thereof. Background technique [0002] When light of different wavelengths passes through the lens, the refractive index is different. Light with long wavelengths has a weak refraction degree, while light with short wavelengths has a strong refraction degree. The cornea in the human eyeball is a convex lens. During the refractive correction test, when the yellow light passes through the cornea, its focus falls on the retina, and the red light with a relatively long wavelength passes through the cornea. After the light passes through the cornea, the focal point falls in front of the retina. Therefore, the emmetropic eye sees the yellow light most clearly, and the red light and green light are relatively blurred. [0003] For myopia, due to the elongation of the eyeball, the focus of yellow light falls on the front of the ret...

Claims

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Application Information

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IPC IPC(8): A61B3/032
CPCA61B3/0325
Inventor 王欣欣朱晓
Owner 明灏科技(北京)有限公司
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