20/20

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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WordNet
20/20

noun
normal visual acuity, as measured by the ability to read charts at a distance of 20 feet [syn: twenty-twenty
WordNet® 3.0, © 2006 by Princeton University.
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