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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 gives a false sense of security to parents and teachers that vision is normal, and serious problems, not revealed in an eye chart test, can go overlooked.
The Eye Chart Does More Harm Than Good by Getz, Donald J. / Special Delivery
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.
Q & A\Advice from experts\Children need more frequent eye exams by Daily News (Los Angeles, CA)
 
 
 
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