an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 8 N) e9 M8 q7 ~5 X1 M8 e
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 2 P! W& d% i7 d! s# K& q3 b7 z4 v# s" g/ E7 p
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!