an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. $ A K1 w' S$ b2 m% c
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. ; B9 r% I. ?$ r: {) O4 u
, ?7 P4 [6 W# W
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!