Dictionary

twenty-twenty

twenty–twenty

adjective twen·ty–twen·ty \-ˈtwen-tē, -ˈtwən-\

: having good vision and able to see without glasses

Full Definition of TWENTY-TWENTY

1
of the human eye :  meeting a standard of normal visual acuity <twenty–twenty vision>
2
:  marked by facilely accurate discernment, judgment, or assessment <hindsight is twenty–twenty>

Variants of TWENTY-TWENTY

twen·ty–twen·ty or 20/20 \-ˈtwen-tē, -ˈtwən-\

Origin of TWENTY-TWENTY

from the testing of vision by reading letters at a distance of 20 feet
First Known Use: 1875

twenty–twenty

adjective twen·ty–twen·ty   (Medical Dictionary)

Medical Definition of TWENTY–TWENTY

:  having the normal visual acuity of the human eye that according to one common scale can distinguish at a distance of 20 feet characters one-third inch in diameter <twenty–twenty vision>

Variants of TWENTY–TWENTY

twen·ty–twen·ty or 20/20 \ˌtwent-ē-ˈtwent-ē\

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