an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. . [. {' `5 D" }8 z1 e$ J5 V5 rvisual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 9 ~& C e: B" j" F( n; {5 v
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请问上面的意思是什么?相当于国内什么等级的视力?谢谢!