Visual chart

A vision chart and card technology, applied in the field of vision charts, can solve problems such as affecting the authenticity of vision, and achieve the effects of preventing cheating, simple structure and convenient use.

Inactive Publication Date: 2012-10-10
THE SECOND FOREIGN LANGUAGE SCHOOL AFFILIATED TO SHANGHAI NORMAL UNIV
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  • Abstract
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Problems solved by technology

[0002] In real life, people must often measure their eyesight, that is, people measure their eyesight by observing the up, down, left, and right directions of the gaps of the E-shaped gaps on the eye chart a few meters in front of the eye chart; If you suffer from myopia yourself, for example, the subject memorizes the opening direction of each row of E on the eye chart in advance, which will inevitably affect the authenticity of the measured vision

Method used

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Embodiment Construction

[0013] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0014] refer to figure 1 , an eye chart, comprising an eye chart body 1 on which several test cards 2 rotating around an axis are arranged.

[0015] Preferably, the test card 2 is fixed on the eye chart body through pins 3 .

[0016] Preferably, the test card 2 is one of round or square.

[0017] Preferably, the word "E" is set on the test card 2 .

[0018] The position and size of the "E" on the test card remain unchanged, but each "E" can rotate around its axis to change the opening direction of the letter, and the test card is fixed on the body of the eye chart by pins. It will fall off, and when a tester completes the measurement, he can change the opening direction of the "E" letter, which is convenient for the next tester to further tes...

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Abstract

The invention discloses a visual chart, which comprises a visual chart body, wherein the visual chart body is provided with a plurality of test cards which rotate around a spindle; the test cards are fixed on the visual chart body by dowels; the test cards are round or square; and the test cards are provided with a word 'E'. Because the test cards can rotate around the spindle, the direction can be continuously changed, and certain cheating phenomena in the optometry can be effectively avoided. The visual chart has the advantages of simple structure and convenience in use.

Description

technical field [0001] The invention relates to an eye chart, which can continuously change the direction of the measuring cards in the eye chart. Background technique [0002] In real life, people must often measure their eyesight, that is, people measure their eyesight by observing the up, down, left, and right directions of the gaps of the E-shaped gaps on the eye chart a few meters in front of the eye chart; If the subject suffers from myopia, for example, the subject memorizes the opening direction of each row of each letter E on the eye chart in advance, which will inevitably affect the authenticity of the measured vision. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an eye chart, which can continuously change the direction of the test card in the eye chart, and the test card can change the direction according to the actual needs, can accurately measure the real vision of the tester, and effectively prev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/032
Inventor 盛云舟
Owner THE SECOND FOREIGN LANGUAGE SCHOOL AFFILIATED TO SHANGHAI NORMAL UNIV
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