an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 4 ` ]' S2 k/ o3 [. c: s I
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. : |6 r" Q% t( u' Z
) a# D# H$ W: c: r
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!