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LASIK手术前后全眼波像差的蒙特卡罗模拟

发表时间:2010-02-15  浏览量:1553  下载量:728
全部作者: 王尧,王肇圻
作者单位: 南开大学现代光学研究所
摘 要: 准分子激光屈光原位层状角膜塑形(laser in situ keratomileusis, LASIK)手术前后全眼像差的统计学分析是当前人眼波像差研究领域的一个热点。通过由Wave Scan获得的手术前后全眼波像差数据,利用蒙特卡罗算法,对LASIK手术前后的全眼波像差进行一系列模拟(包括符号模拟、数值模拟及子午频率模拟),用调制传递函数比(modulation transfer function ratio,MTF ratio)表征像差是否独立。模拟后发现:在完成3种蒙特卡罗模拟之后,手术前后全眼像差的MTF ratio均大于1.0,并且手术后全眼像差的MTF ratio大于手术前的MFT ratio. 通过Matlab程序,得到100只蒙特卡罗模拟眼。对这些眼进行同样的3种蒙特卡罗模拟,发现MTF ratio均小于1.0. 3种蒙特卡罗模拟结果表明:真实人眼具有自适应性,并且手术后人眼的自适应性增强。
关 键 词: 视觉光学;LASIK手术;蒙特卡罗模拟;调制传递函数比;模拟眼
Title: Monte Carlo simulations on total aberrations before and after LASIK
Author: WANG Yao, WANG Zhaoqi
Organization: Institute of Modern Optics, Nankai University
Abstract: It is a hot research field which statistically analyses on total aberrations, before and after laser in situ keratomilevsis (LASIK), for a set of eyes. In this paper, the data of total aberrations are got from Wave Scan. Then a series of Monte Carlo simulations (including sign simulation, value simulation and meridional frequency simulation) are performed by manipulating each Zernike coefficient (second through sixth-order) of total aberrations. The results are evaluated by modulation transfer function (MTF) ratio. After Monte Carlo simulations, the MTF ratios for pre-LASIK and post-LASIK eyes are both more than 1.0, and the value for post-LASIK eyes are larger than the one for pre-LASIK eyes. The 100 synthetic eyes are got by Matlab, then the same three Monte Carlo simulations are performed. The result is that the MTF ratios are less than 1.0. It is concluded that there is apparent advantage for the complete eyes true aberrations over random aberrations, whether pre-LASIK or post-LASIK, and the ability of adaptive mechanism of human eyes increases after LASIK.
Key words: visual optics; LASIK surgery; Monte Carlo simulation; modulation transfer function ratio; synthetic eyes
发表期数: 2010年2月第3期
引用格式: 王尧,王肇圻. LASIK手术前后全眼波像差的蒙特卡罗模拟[J]. 中国科技论文在线精品论文,2010,3(3):210-214.
 
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