要是你在严寒中用湿手去抓铁器,那可是自找倒霉:一下就会让铁器粘住,甚至会粘掉你一层皮。不过,有些医生却从中看出了门道。他们利用这种现象来给白内障病人动手术。人的眼睛好象一个照像机,而晶状体的作用则和镜头差不多。晶状体在瞳孔后面,是个透明的扁圆形组织,两面凸出,好像一片很厚的凸透镜。晶状体有弹性,可以为睫状体所调节,使外界物体的影像清晰地落在视网膜上面。晶状体遇到损伤、毒素作用或是新陈代谢障碍,会发生 If you use wet hands to catch the iron in the bitter cold, you’re looking for a bad luck: once you let the iron stick, or even stick you away. However, some doctors see the doorway. They use this phenomenon to operate cataract patients. The human eye looks like a camera, and the lens works like a lens. Behind the pupil, the lens is a transparent, oblate tissue that projects on both sides as if it were a thick convex lens. The lens is flexible and can be adjusted by the ciliary body so that the image of the external object can be clearly placed on the retina. The lens may suffer damage, toxins, or metabolic disorders.