Definitions for visual acuity
Random House Webster's College Dictionary
vis′ual acu′ity(n. .)
acuteness of the vision as determined by a comparison with the normal ability to identify certain letters at a given distance, usu. 20 ft. (6 m).
Origin of visual acuity:
acuity, visual acuity, sharp-sightedness(noun)
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
U.S. National Library of Medicine
Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.
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