Snellen test


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Snellen test

[′snel·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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The Snellen Test is still done in daylight using B&W letters giving 100% contrast, which does not replicate the varied visual demands at sea.