Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)

Etymologies

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