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English definition of “twenty-twenty vision”

twenty-twenty vision

noun [U]     /ˌtwen.tiˌtwen.tiˈvɪʒ.ən/ US  /-t̬iˌtwen.t̬i-/ (also 20/20 vision)
perfect sight , especially as measured by a standard test : The optician told me I had twenty-twenty vision .Eyesight, glasses and lensesUsing the eyesThe eye and surrounding areaOptics, microscopy and lasers
(Definition of twenty-twenty vision noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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