an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 8 d) H0 p* u+ E! h5 ~0 pvisual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 9 X# P' ^3 J) m1 m5 }5 s
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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!