Based on the diopter status of myopia and hypermetropia , the paper presented the principle of excimer laser refractive surgery , the change of impacting cornea curvature on the cornea diopter . in this chapter , we also discussed excimer laser - corneal tissue interactions and photoablation . determine the relationship between the fluence of arf excimer laser and the cornea ablation rate , attain the relationship between the energy density and the ablation depth 研究了激光与生物组织相互作用、光蚀作用及准分子激光消融角膜的机理；首次定量研究193nm准分子激光高斯光束的切削量与能量密度的关系，计算单个激光脉冲角膜切削量；发现了角膜曲率对切削效果的影响，首次提出了角膜曲率半径、切削位置与切削深度的关系；首次定量确定了激光光斑参数及其排列方式对术后角膜表面粗糙度的影响，为更精确实现角膜切削和提高切削后角膜表面光洁度、减少手术后角膜浑浊及角膜表面术后不规则提供了理论依据。
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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 以数学的方法研究出了屈光性单纯近视、屈光性单纯远视、复性近视散光、复性远视散光、单纯近视散光、单纯远视散光、混合性散光屈光矫正的物理模型；并揭示了不同轴位的转换规律，对不同散光情况下的初始角膜两个不同方向的曲率半径和手术后最终的曲率半径作了定量的研究。
