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
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[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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