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Snellen test

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.
Snellen test [′snelĀ·ən ‚test]
(medicine)
A test for visual acuity presenting letters, numbers, or letter E's in various positions, with the symbols varying in size; if the smallest are read at a distance of 20 feet (6 meters), vision is recorded as 20/20, or normal.


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They also perform the standardized Snellen test, during which the patient covers one eye at a time and identifies letters on a chart from 20 feet away.
 
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