1925
DOI: 10.1097/00006324-192510000-00013
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The Percentage Evaluation of Macular Vision

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Cited by 8 publications
(8 citation statements)
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“…A major advantage of Snellen letters, which surely must have contributed to their wide clinical use, is that each symbol has greater information content than that in any similar test, yet it comes from an ensemble that is now universally available to all examinees. A widely accepted study (209) places equally discriminable steps in a logarithmic relation to minimum angle of resolution. The resulting need of correction for guessing has recently been pointed out (179).…”
Section: Tests For Visual Acuitymentioning
confidence: 99%
“…A major advantage of Snellen letters, which surely must have contributed to their wide clinical use, is that each symbol has greater information content than that in any similar test, yet it comes from an ensemble that is now universally available to all examinees. A widely accepted study (209) places equally discriminable steps in a logarithmic relation to minimum angle of resolution. The resulting need of correction for guessing has recently been pointed out (179).…”
Section: Tests For Visual Acuitymentioning
confidence: 99%
“…The corrected visual acuity of both eyes in patients was recorded. For quantitative comparison with other measurements the values obtained were scaled for visual efficiency by the method of Snell and Sterling (1925). Visual acuity less than 6/60 was scaled zero efficiency.…”
Section: Methodsmentioning
confidence: 99%
“…Claro, então, que também aparece o sinal "invertido" (negativo para a e positivo para V) com discriminações visuais acima da normalmente convencional (a < 1′, V > 1,0). d) Finalmente, a escala de "eficiência visual de SnellSterling" (2) parte do pressuposto de uma relação progressiva de 83,6% a cada minuto de arco de variação. Essa escala é, pois, exponencialmente decrescente seguindo a fórmula E = 100 e -0,179 (a -1) em que e é a base dos logaritmos naturais (ou neperianos), e = 2,718281828 (* ) .…”
Section: Escalasunclassified