Visual chart

An eye chart and visual acuity technology, applied in the field of eye chart, can solve problems such as false vision values

Inactive Publication Date: 2016-06-15
付虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, many physical examinations involve visual acuity examination, and in some occasions, in order to improve their visual acuity to a certain standard value, people with poor vision adopt the method of reciting the visual acuity chart, and the symbols on the existing visual acuity chart are not allowed. adjusted, which leads to false visual acuity values ​​tested by this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] An eye chart, characterized in that the positions on the eye chart corresponding to the eye chart of the visual acuity value can be exchanged. Interchange can be realized by using many methods in the prior art.

Embodiment 2

[0011] For embodiment 1, preferred in this embodiment, the eye chart includes a table body printed with multiple rows of visual acuity values, the eye chart symbol is set on the table body, the eye chart symbol is connected with the table body by a magnetic or sticky structure, The position between the visual acuity chart symbol and the visual acuity value is exchanged manually.

[0012] This embodiment can be completed on the basis of the original eye chart with a little increase in cost. Through the magnetism of the magnet or the stickiness of the glue bonding, etc., the manual exchange is realized, and the obtained position cannot be realized by the person being tested by reciting.

Embodiment 3

[0014] For Embodiment 1, preferably in this embodiment, the eye chart includes a display screen with visual acuity chart symbols showing multiple lines of visual acuity values ​​and corresponding visual acuity values, and a control circuit for driving the display screen to display, and the control circuit has a control circuit for controlling the visual acuity value of the display screen. A circuit or a control switch that switches the positions of the eye chart symbols within the same range of visual acuity values.

[0015] In this embodiment, an electronic circuit is used to automatically realize the exchange, which is extremely simple and does not increase too much cost. Automatic adjustment and random display are realized, and the disadvantages caused by human factors are eliminated.

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PUM

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Abstract

The invention discloses a visual chart which is characterized in that positions of visual chart symbols of the same visual value on the visual chart are interchangeable. According to the visual chart, through manual or circuit exchange, free adjustment of the visual chart symbols of the same visual value on the visual chart is achieved, and the problem that in the prior art, recitation of the visual chart cannot be coped with is solved.

Description

technical field [0001] The invention relates to an eye chart, which is used for detecting the vision of human eyes. Background technique [0002] 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. Nowadays, many physical examinations involve visual acuity examination, and in some occasions, in order to improve their visual acuity to a certain standard value, people with poor vision adopt the method of reciting the visual acuity chart, and the symbols on the existing visual acuity chart are unacceptable. Adjusted, which leads to false visual acuity values ​​tested by this method. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/032
CPCA61B3/032A61B3/0041
Inventor 付虎
Owner 付虎
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