出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/30 10:39 UTC 版)
A Snellen chart is an eye chart used by eye care professionals and others to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Hermann Snellen who developed the chart during 1862. Vision scientists now use a variation of this chart, designed by Ian Bailey and Jan Lovie (see "visual acuity").