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A percentile vision chart

An eye chart and percentage system technology, applied in the field of eye chart, can solve the problems of inability to overprint between large and small visual marks, occupy a large area, and have different grades of vision resolution, and achieve the effects of reduced size, convenient transportation, and convenient processing and manufacturing

Active Publication Date: 2017-12-29
陈登民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large and small visual marks on the eye chart cannot be overprinted and occupy a large area; whether it is the decimal scoring method of standard vision (0.1-2.0) or the logarithmic scoring method of the logarithmic vision chart (4.0-5.3), it is not easy In the minds of the testers, there is a clear difference in the grades of vision resolution
Because the printing direction of the visual mark on the eye chart is fixed, it is often cheating to memorize the direction of the visual mark in the eye chart

Method used

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Such as figure 1 , 2 As shown, the visual mark of the hundred-point system eye chart is a gap ring, the gap is fan-shaped, the central angle is 12.76 degrees, and the 5-meter test is 100 points. The outer diameter is 1.454×10=14.54 mm, the inner diameter of the ring is 1.454×8=11.63 mm, and the ring width is 1.454 mm. 10 times the width (10a), the inner diameter of the ring is 8 times the ring width (8a), with the 100-point visual mark as the base point, the size of the 90-point visual mark and below increases outward, and the 100-point visual mark ring outer diameter is taken as the 90-point visual mark The inner diameter of the standard ring, the size data of the outer diameter of the 100-point visual mark ring ÷ 8 is the ring width of the 90-point visual mark, and the ring width × 10 is the outer diameter of the 90-point ring, that is, the outer diameter, i...

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Abstract

Disclosed is a centesimal visual acuity chart. The centesimal visual acuity chart is characterized in that a centesimal system is adopted to express visual acuity, so that the better the visual acuity is, the higher the score. Each visual target of the visual acuity chart is in the shape of a notched ring, a notch is fan-shaped, a circle center angle is 12.76 degrees, width of the ring is equal to that of the middle of the notch, outer diameter of the ring is 10 times of width of the ring while inner diameter of the same is 8 times of width of the ring, size of the visual targets is in continuous gradient changing, and a vision score difference of each gradient is 10 scores.100 scores is for a test of 5 m, the width of the middle of the notch is 1.454 mm, the visual target of 100 scores is taken as a base point, the size of the visual targets of 90 scores and lower scores is sequentially increased progressively outward by 1.25 times, and the size of the visual targets of 110 scores and higher scores is sequentially decreased progressively inward by 0.8 time. The visual targets can sleeved and overlapped at intervals according to size order to form four groups to be combined into the visual acuity chart, and size of the visual acuity chart is reduced. The visual acuity chart can be made into an electronic product, namely a visual acuity tester, by using a led semitic form to increase interestingness when visual acuity of children is tested.

Description

technical field [0001] The invention relates to an eye chart, in particular to a precise hundred-point eye chart for detecting the resolution ability of human eyes. Background technique [0002] Existing eye charts include Landolt circular eye chart, i.e. C word chart, logarithmic eye chart and standard eye chart. The latter two are E word charts. The vision chart is designed based on the principle of viewing angle. The standard vision chart measured at 5 meters away is 1.0 and the logarithmic vision chart is 5.0. The viewing angle is 1 point of view (1 degree = 60 points). The visual acuity is the reciprocal of the viewing angle, that is, the =1 / angle of view, if the angle of view is 1, the visual acuity is 1 / 1'=1.0, when the visual angle is 10, the visual acuity is 1 / 10'=0.1, that is, for 1.0 visual acuity, the opening of the letter C (1-point viewing angle) is 1.454 mm, and the outer diameter of the ring It is 1.454×5 mm, the inner diameter of the ring is 1.454×3 mm, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/032
CPCA61B3/0041A61B3/032A61B2503/06
Inventor 陈登民陈琳琳
Owner 陈登民
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