Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Having normal visual acuity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Having normal visual acuity.

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

  • noun normal visual acuity, as measured by the ability to read charts at a distance of 20 feet

Etymologies

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

[From a method of testing vision by reading charts at a distance of 20 feet.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From a method of testing vision by reading charts at a distance of 20 feet.

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