视力一直正常的人,看远看近都很清晰,可是到了40多岁,看远还是清晰的,但读书看报,要放得远一些才能看清楚。再过些时候,伸长手臂,放得够远够远的了,还是不能看清楚,穿针引线也是力不从心了。这是为什么?人一般都知道这是有了老花眼,也就是老视。人尚处于中年,离老还有10来年的时间,眼睛怎么就与“老”字挂上了钩?问题在眼内的晶状体。晶状体位于瞳孔后面正中的位置,呈双面凸起,如同一 Eyesight has been normal people, look far and near are very clear, but in their 40s, look far or clear, but read the newspaper, put some far to see clearly. Some time later, the extension of the arm, put far enough far away, or can not see clearly, the needle is also powerless. This is why? People generally know that this is presbyopia, that is, presbyopia. People are still middle-aged, 10 years from the old time, how the eyes and the “old” hung up the hook? Problems in the eye of the lens. The lens is located in the middle of the pupil behind the position, was double-sided raised, as one