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Snellen eye chart : ウィキペディア英語版
Snellen chart

A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862.〔H. Snellen, Probebuchstaben zur Bestimmung der Sehschärfe, Utrecht 1862.〕 Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.
==History==
Snellen developed charts using symbols based in a 5x5 unit grid. The experimental charts developed in 1861 used abstract symbols.() Snellen's charts published in 1862 used alphanumeric capitals in the 5x5 grid. The original chart shows A, C, E, G, L, N, P, R, T, 5, V, Z, B, D, 4, F, H, K, O, S, 3, U, Y, A, C, E, G, L, 2.()

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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