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Related to twenty-twenty: Twenty twenty cricket
twen·ty-twen·tyor 20/20 (twĕn′tē-twĕn′tē, twŭn′tē-twŭn′tē)
Having normal visual acuity.
[From a method of testing vision by reading charts at a distance of 20 feet.]
(Medicine) med (of vision) being of normal acuity: usually written 20/20
having normal visual acuity.
[1870–75; so called from the testing of vision with standard eye charts from a distance of 20 feet]