an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. # f: A) L% b7 O4 O& D ~7 B1 c
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. * g! r# @5 _% c2 {0 ]! n; Q
" S4 M; [" q9 T0 c. ?
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!