an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. + N* e3 K1 @! ^/ J ^* ?
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. % b7 f$ \5 k% C- r* s% Q, u$ v+ Q: X3 \% E1 ?/ r
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!