an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. - O1 i. C2 W0 i8 T
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 8 H! ?: u/ d& Y8 _
; n4 k# X& m: _5 d4 i! Q1 Y5 x& I
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!