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Original ArticleOpen Access
New Visual Acuity Chart : Modification for Clinical Prac-tice and Research
Pisarnkorskul P 
,
Singhkuna L
,
Singhkuna L The authors created numeric optotypes by steps following the standard Sloan letters and
developed a visual acuity test chart using Logarithm of the Minimal Angle of Resolution (Log MAR)
such as the Early Treatment Diabetic Retinopathy Study (ETDRS) chart. Legibility of new numeric
optotypes was presented in per cent of correct response at threshold. Only seven numbers (0, 2, 3,
5, 6, 8, 9) were used as optotypes and the average of per cent of correct response at threshold equal to
80.7 which was slightly less than standard Sloan letters (82%). The comparison between results of
visual acuity level from the new chart and ETDRS showed that the ETDRS chart was slightly more
legible than the new chart.
It
can be used universally especially with Thai people for clinical practice
and research.
Key word : Sloan Letters, Visual Acuity Test Chart, Log MAR Chart, ETDRS Chart
developed a visual acuity test chart using Logarithm of the Minimal Angle of Resolution (Log MAR)
such as the Early Treatment Diabetic Retinopathy Study (ETDRS) chart. Legibility of new numeric
optotypes was presented in per cent of correct response at threshold. Only seven numbers (0, 2, 3,
5, 6, 8, 9) were used as optotypes and the average of per cent of correct response at threshold equal to
80.7 which was slightly less than standard Sloan letters (82%). The comparison between results of
visual acuity level from the new chart and ETDRS showed that the ETDRS chart was slightly more
legible than the new chart.
It
can be used universally especially with Thai people for clinical practice
and research.
Key word : Sloan Letters, Visual Acuity Test Chart, Log MAR Chart, ETDRS Chart
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