an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. : d( M3 c: L' f
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 6 u- o9 L+ ?' m( _, s5 N1 G1 [3 v
h. o5 d1 `0 e
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!