[skyeye]

问有眼科医学知识的妈妈? 能不能帮我解释一下这段话
Vision. You must have a distant visual acuity of not less than 6/9 in metric (20/30 in feet) in each eye separately with or without the use of correcting lenses. Where the standard of visual acuity can be obtained only with correcting lenses, you may be assessed fit provided that:
1.

you wear such correcting lenses when exercising the privileges of the license or rating applied for or held;
2.

you have a visual acuity without correction in each eye separately of not less than 6/60 in metric (20/200 in feet) and the refractive error falls within the range of plus or minus five diopters (equivalent spherical error); and
3.

you have a spare pair of suitable correcting glasses available for immediate use when exercising the privileges of your license.

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[Mayme]

视力. 无论裸视或使用校正型镜片, 你每一个眼睛的视力必须不低于6/9或(20/30).如果你戴着校正型镜片方能达到视力标准, 那你还需要符合以下要求:
1, 当你行驶执照赋予的权利时,或等级申请,或持有时,要戴校正型眼镜.
2, 你每一个眼睛的裸视视力不能低于6/60 或20/200,屈光误差保持在+/- 5 屈光度(远视或近视者角膜和水晶体对光线的折射度).
3, 当你行使执照时,你随时都得有一副合适的备用眼镜.

*20/20 是标准视力. 能清晰得辨认距离你20尺远的物体.