an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. # O4 w1 t8 u1 h5 o
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. ' ?! L& q. `; M1 h) k: g; \
& X M& [% Q! [' m2 ~5 V; m请问上面的意思是什么?相当于国内什么等级的视力?谢谢!