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twenty-twenty

[twen-tee-twen-tee, twuhn-tee-twuhn-tee] /ˈtwɛn tiˈtwɛn ti, ˈtwʌn tiˈtwʌn ti/
adjective
1.
Ophthalmology. having normal visual acuity.
2.
keenly or acutely perceptive:
an opinion based on twenty-twenty hindsight.
Also, 20-20.
Origin
1935-1940
1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for twenty-twenty

twenty-twenty

adjective
1.
(med) (of vision) being of normal acuity: usually written 20/20
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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twenty-twenty in Science
twenty-twenty or 20/20
  (twěn'tē-twěn'tē)   
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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12
12
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