twenty twenty

twenty-twenty

[twen-tee-twen-tee, twuhn-tee-twuhn-tee]
adjective
1.
Ophthalmology. having normal visual acuity.
2.
keenly or acutely perceptive: an opinion based on twenty-twenty hindsight.
Also, 20-20.


Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
twenty-twenty
 
adj
med (of vision) being of normal acuity: usually written 20/20

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
twenty-twenty or 20/20   (twěn'tē-twěn'tē)  Pronunciation Key 
Having normal visual acuity. A person with twenty-twenty vision can see type as small as one-third of an inch at a distance of twenty feet.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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