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Snellen

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Noun1.Snellen - Dutch ophthalmologist who introduced the Snellen chart to study visual acuity (1834-1908)
Hermann Snellen
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Snellen previously worked as an in-home care provider in southern California.
BUSINESS BEAT by The Register-Guard (Eugene, OR)
It refers to central visual acuity of 20/200 or less in the better eye with the best possible correction, as measured on a Snellen vision chart, or a visual field of 20 degrees or less.
VOICE TECHNOLOGY ENABLES VISUALLY IMPAIRED TO USE COMPUTERS by Audiotex Update
The DVLA say this corresponds to a score of between 6/9 and 6/12 on a visual test known as the Snellen chart.
Road sight tests doubt by Daily Record (Glasgow, Scotland)
 
 
 
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