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
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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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