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visual acuity

noun, Ophthalmology
1.
acuteness of the vision as determined by a comparison with the normal ability to define certain letters at a given distance, usually 20 feet (6 meters).
Abbreviation: V.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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visual-acuity in Medicine

visual acuity n.
Sharpness of vision, especially as tested with a Snellen chart. Normal visual acuity based on the Snellen chart is 20/20.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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