or 20/20 adjective Etymology: from the testing of vision by reading letters at a distance of 20 feet Date: 1875 meeting a standard of normal visual acuity , marked by facilely accurate discernment, judgment, or assessment
TWENTY-TWENTY
Meaning of TWENTY-TWENTY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012