an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 0 k8 G1 B) p( }% @& P* l- @
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. `& E2 _5 p) S: P, ?
4 |+ O1 w% N1 A6 Z8 n. B h
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!