Chapter 3 erected the relationship between refraction error and cornel ablation depth in theory . the paper proposed various mathematical models which can be used for proceed the simple myopia , simple hypermetropia , compund myopia astigmatism , compund hypermetropia astigmatism , simple myopia astigmatism , simple hypermetropia astigmatism , mixed astigmatism . the influence of the astigmatic axis and the degree of astigmatism on the correction field is discussed . wavefront aberration guided excimer laser cornea ablation is a main method of customised corneal ablation 以數(shù)學(xué)的方法研究出了屈光性單純近視、屈光性單純遠(yuǎn)視、復(fù)性近視散光、復(fù)性遠(yuǎn)視散光、單純近視散光、單純遠(yuǎn)視散光、混合性散光屈光矯正的物理模型;并揭示了不同軸位的轉(zhuǎn)換規(guī)律,對不同散光情況下的初始角膜兩個不同方向的曲率半徑和手術(shù)后最終的曲率半徑作了定量的研究。