an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. 9 k* ~1 S) ^1 e& ?
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. / Q, z# `. B4 |& m
% p4 A6 L+ d% b* u
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!