an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. ) i! F- a2 C# X3 H( G9 O$ V
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. ' t/ m6 q: H. X1 g5 |. P2 Y2 }% V/ S ^
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!