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General type visual chart

An eye chart, a universal technology, applied in medical science, eye testing equipment, diagnosis, etc., can solve the problems of inconvenient conversion, inconvenient use, and less than 5 meters, so as to achieve easy recording and statistical analysis, Strong fairness and high accuracy

Inactive Publication Date: 2008-01-23
PLA NAVY GENERAL HOSIPTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is inconvenient to convert these two vision recording methods at present.
[0004] In addition, the standard distance for traditional eye chart detection is 5 meters, and the depth of the housing space is required to be more than 5 meters. If it is less than 5 meters, a reflector needs to be installed.
This is inconvenient to use

Method used

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  • General type visual chart
  • General type visual chart

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, as shown in Figure 1, the 14 rows of E-shaped optotypes of the universal vision chart of the present invention are arranged from large to small from top to bottom along the vertical axis, and each optotype in each row is the same in size and equal in spacing. The size of the visual mark in adjacent rows is arranged according to the 10th root increase rate of 10. Each row is composed of 4 optotypes, which are up, down, left, and right, and their arrangement order in each row is irregular. The distance between each visual mark line and the next visual mark line is equal to the height of the visual mark in this line. The specified test distance is 3 meters. The corresponding decimal notation, logMAR notation and fractional notation values ​​are marked on both sides of each row of optotypes. The visual acuity chart is also equipped with a conversion table for logMAR visual acuity and fractional visual acuity.

Embodiment 2

[0017] Embodiment 2, as shown in Figures 2 and 3, the 14 rows of C-shaped visual targets of the universal vision chart of the present invention are arranged from large to small from top to bottom along the vertical axis, and each visual target has the same size and spacing in each row. Equal, the size of the visual mark in adjacent rows is arranged according to the 10th root increase rate of 10. Each row is composed of 4 optotypes, which are up, down, left, and right, and their arrangement order in each row is irregular. The distance between each visual mark line and the next visual mark line is equal to the height of the visual mark in this line. The specified test distance is 3 meters. The corresponding decimal notation, logMAR notation and fractional notation values ​​are marked on both sides of each row of optotypes. The visual acuity chart is also equipped with a conversion table for logMAR visual acuity and fractional visual acuity. An astigmatism detection meter (1) ...

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Abstract

The general type visual chart has several rows of visual marks arranged from top to bottom with large ones in the top side. Each row has 4 or 4n visual marks in different directions, including upwards, downwards, rightwards and leftwards, separately, with n being integral number. In addition, astigmatism detecting chart and myopia and hyperopia detecting chart may be also provided simultaneously for expanding the functions.

Description

technical field [0001] The invention relates to a vision detection device, in particular to a universal vision chart. Background technique [0002] At present, the commonly used vision charts in the medical field are "International Standard Vision Chart" and "Standard Logarithmic Vision Chart". The one that opens up and down is a horizontal sight mark, and the one that opens to the left and right is a vertical sight mark. In the "International Standard Vision Chart" and "Standard Logarithmic Vision Chart", the number of horizontal and vertical optotypes listed in some optotype rows is different. For example, in a row of five optotypes, horizontal Compared with the vertical visual standard, the visual standard is 3:2 or 2:3. Such a difference in visual targets will not cause detection errors for people with spherical ametropia, but it may cause detection errors for subjects with astigmatism (test eyes). When the number of horizontal visual targets is more than that of vert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/032
Inventor 李刚颜少明张方华彭秀军
Owner PLA NAVY GENERAL HOSIPTAL
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