snellen : Idioms & Phrases
hermann snellen
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noun Dutch ophthalmologist who introduced the Snellen chart to study visual acuity (1834-1908)
Snellen.
WordNet
snellen chart
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noun display consisting of a printed card with letters and numbers in lines of decreasing size; used to test visual acuity
WordNet
snellen test
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noun a test of visual acuity using a Snellen chart