Snellen test

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a test of visual acuity using a Snellen chart

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References in periodicals archive ?
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.
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.
They probably did the test we all know, the 1862 Snellen Test for distance vision.
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.