This is compounded by the fact that long exposures to microgravity have been shown to exacerbate presbyopia in astronauts .
雪上加霜的是,长时间曝光于微重力之下已被证实会加剧宇航员的老花眼。
If you find the green field clearer than the red field , you may get presbyopia ( old-sight ) already .
如果你觉得绿色一边较红色清楚,你可能经有老花了。
If you don 't spend a lot of time looking at a computer screen until after 45 when you 've almost certainly got glasses for presbyopia your glasses are taking some of the focusing " workload " off your eyes .