an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 2 x2 L1 w' w4 g6 y9 k' ]% Lvisual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. . F6 x2 ?& x$ T h. N- e
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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!