20/20 VISION
Meaning of 20/20 VISION in English
20/20 vi·sion /ˌtwenti twenti ˈvɪʒ ə n/ BrE AmE noun [uncountable]
the ability to see perfectly without needing to wear glasses
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012