an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. . _1 Q3 D$ u' G8 \5 x4 {
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. " d1 V7 T) G5 _+ A+ r g L* H+ U7 y/ g4 _/ p" A; ^6 f, ~! f/ b
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!