an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. ( Q3 \" B3 U9 Z$ H7 t
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 5 [/ k6 E# ?+ I+ l& S; O
! L/ |$ F7 ~0 p! g/ E w0 T$ x* _
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!