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人的眼睛是一个由不同介质组成的共轴光学系统,远物或近物发出的进入睛睛的那部分光线,经过一系列的反射和折射,其反射光返回物空间,折射光都能在视网膜上聚焦成清晰像。然而,人眼对不同距离的物体成像中,并不像照相机镜头那样调焦,而是通过睫状肌压缩睛珠(或水晶体)使其两面曲率半径发生变化而得以实现。因而在观察无限远物和近物时,眼睛光学系统的光焦度、两主点位置、两焦距长短等光学常数是不同的,说明眼睛是一完好而简捷的
The human eye is a coaxial optical system composed of different media. The part of the light entering the eye from a distant object or near object passes through a series of reflections and refractions, and its reflected light returns to the object space. The refracted light can be reflected in Focus on the retina into a clear image. However, the human eye does not focus on the objects of different distances in focus as the camera lenses do, but rather the eyeballs (or crystals) are compressed by the ciliary muscle to change the radius of curvature of both surfaces. Therefore, in the observation of infinity and near objects, the optical power of the optical system of the eye, the two main points of position, the two optical constants are different, indicating that the eye is intact and simple