浅析人眼的屈光度

Some analysis on the eye dioptric strength

人眼是一个复杂的光学系统,近似于球状,可以看成是一个小小的相机,为了看清不同距离的被视物,眼睛必须调焦,而这是通过晶状体曲率的改变来达到的.可以利用一块凹透镜L1与一块凸透镜L2,根据它们间距离相对变化时,整个系统可得出各种不同的球面焦度这一原理,来测定人眼的屈光度.

The eye is a complicated system,which may be treated as a camera,in order to see everything in different distance clearly,it has to adjust the focal length with the curvature changing of the crystalline lens.When the distance between a concave lens and a conves lens changes,varied dioptric strength can be got in the system.Then,dioptric strength of the eye will be determined.