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English definition of “20/20 vision”

20/20 vision

noun [S] uk   /ˌtwen.tiˌtwen.tiˈvɪʒ.ən/ us  
the ability to see perfectly, without needing to wear glasses or contact lenses: You're so lucky to have 20/20 vision, Dom.Eyesight, glasses and lensesUsing the eyesThe eye and surrounding areaOptics, microscopy and lasers
(Definition of 20/20 vision from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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