an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 5 i- A1 G# f% l. j
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 9 c. ^) d' ?! n0 ?& P, Q% h- t, G
" k6 \3 b H: |1 l. H2 n1 o
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!