LEARNit Dictionary
twenty-twenty vision
noun
/ˌtwenti ˌtwenti ˈvɪʒn/
UK
/ˌtwenti ˌtwenti ˈvɪʒn/
US
1
the ability to see clearly from a distance of 20 feet, without using glasses or contact lenses
بینایی بینقص, بینایی ۲۰/۲۰