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Method and device for visual inspection

A vision detection and control device technology, applied in eye testing equipment, medical science, diagnosis, etc., can solve problems such as affecting vision detection results, affecting detection accuracy, and testing distance, etc., and achieves convenient use, simple structure, and operation. handy effect

Active Publication Date: 2018-05-25
四川远瞻智汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above prior art has the following defects. 1. An indoor distance of 2-10 meters is required when visual acuity is detected or the detection distance is shortened by placing a plane mirror; 2. A quiet environment is required, and the detection results are easily affected by the environment such as light; 3. , The "E" character arrangement is fixed, and the memory of the testee will affect the vision test results; 4. The tester and the testee need to cooperate with each other, which is easy to make mistakes; 5. The test distance is long, and subjective judgment will affect the accuracy of the test

Method used

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  • Method and device for visual inspection
  • Method and device for visual inspection

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A visual inspection method, comprising the steps of:

[0042] A. Select a positive lens to obtain the focal length f of the positive lens;

[0043] B. Calculate the object distance and the side length of the new character according to the formula;

[0044] b1. First formula In the first formula, L: image distance, f: positive lens focal length, X: object distance; calculate the object distance X according to the first formula;

[0045] b2. The second formula In the second formula, L: image distance, M: new character side length, N: national standard character side length, X: object distance; calculate the new character side length M according to the second formula;

[0046] C. Set a new character in a square area with side length M as the side length of the new character, and set the positive lens at a distance X from the new character.

[0047] A further improvement is that N in step b2 of step B is the character side length of characters in the Chinese National ...

Embodiment 2

[0057] Such as figure 2 Shown, a kind of visual acuity detection device comprises positive lens and character table; Described character table is provided with more than one new character; The distance between described positive lens and character table is X, and the new character of described new character The side length is M.

[0058] Such as figure 2 As shown, the positive lens includes a first positive lens 14 and a second positive lens 15, which are placed side by side during use, and the distance matches the distance between the eyes of a person; the character list containing more than one new character is set On the reticle 16; the new characters on the reticle 16 can be seen by the second optical axis 13 of the first positive lens 14 and the second positive lens 15, and the reticle 16 is at a distance from the first positive lens 14 and the second positive lens 15. The X places of the two positive lenses 15 are placed vertically.

[0059] A further improvement is...

Embodiment 3

[0067] Such as image 3 Shown, a kind of visual inspection device comprises positive lens and character list; Described character list is provided with more than one new character; The distance between described positive lens and character list is X, and the new character of described new character The character side length is M.

[0068] Described positive lens is the 3rd positive lens 2, and described character table is arranged on film 5, can see the new character in the character table on film 5 through the first optical axis 1 of 3rd positive lens 2, described new The side length of the characters is M; the distance between the third positive lens 2 and the film 5 is X.

[0069] A further improvement is that it also includes a light chamber and a light source for supplementing light for the character table, the positive lens is arranged at one end of the light chamber, the character table is arranged at the other end of the light chamber, and the light source is arranged...

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Abstract

The invention belongs to the technical field of eyesight detection, particularly relates to an eyesight detection method and an eyesight detection device, and aims to solve the technical problem in the prior art that an existing eyesight detection chart is easily influenced by the environment when being used for detecting eyesight, and the detection result easily goes wrong. The method comprises the following steps: A, selecting a plus lens to obtain the focus f of the plus lens; B, calculating the object distance and new character side length according to a formula; and C, setting a new character in the square region which uses the new character side length M as the side length, and setting the plus lens at the position X from the new character. The invention further provides an eyesight detection device. The device comprises the plus lens and the character chart, and more than one new character is arranged on the character chart, wherein the distance between the plus lens and the character chart is X, and the side length of the new character is M. The eyesight detection method is simple, convenient and practical and has an accurate eyesight detection result. The eyesight detection device has the advantages of simple structure and convenience in operation.

Description

technical field [0001] The invention belongs to the technical field of vision detection, and in particular relates to a vision detection method and device. Background technique [0002] For the detection of visual acuity, the general practice in the world is to detect visual acuity by adopting a standard eye chart. Eye charts are designed based on the principle of visual angle. The so-called angle of view is the angle formed by the light emitted by two external points and the node in the eye. Under normal circumstances, the human eye can distinguish the angle of view formed by the minimum distance between two points as the minimum angle of view, that is, one point of angle of view. The eye chart is designed in units of one point of view. Visual acuity is generally divided into two categories: distance vision and near vision. The international standard vision chart consists of 12 rows of "E" characters with different sizes and opening directions; the measurement ranges fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/032
CPCA61B3/0041A61B3/0075A61B3/032
Inventor 陇涤湘陇华
Owner 四川远瞻智汇科技有限公司