an uncorrected visual acuity of at least 20/40 (6/12) with both eyes open. $ B5 L6 I3 S& t8 r, {
visual aids (glasses or contact lenses) must have vision of 20:20 (6:6) with both eyes open. 8 O7 ]: x- z8 C* S) n
. B3 m: W' _# }. V
请问上面的意思是什么?相当于国内什么等级的视力?谢谢!