twenty-twenty
twen·ty–twen·ty
adj \-ˈtwen-tē, -ˈtwən-\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>
See 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
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