摘要
分析基于不同Placido面型的角膜地形图测量光学系统造成的像差影响,为角膜地形图测量反射面的面型优化设计提供新方法。利用平面对称光学系统像差理论建立优化反射面面型的像差评价函数,提出了一种基于遗传算法改进的非球面多参数组合衍化算法,求解出满足像差评价函数的非球面面型系数和半径,分析了不同反射面对光学系统成像效果的影响。长椭球面型可以获得更小的评价函数值,同时满足角膜地形图的光学设计要求。相较于扁椭球面、球面和抛物面,长椭球面更适合作为基于Placido的角膜地形图的反射面面型。
To analyze the aberration influence caused by the optical system of corneal topography measurement based on different Placido surface types,and provide a new method for the optimal design of corneal topography measurement reflecting surface.Using the aberration theory of plane symmetric optical system,the aberration evaluation function for optimizing the reflection surface shape was established,and an improved aspheric multi-parameter combination derivation algorithm based on genetic algorithm was proposed.The aspheric surface shape coefficient and radius satisfying the aberration evaluation function were solved,and the influence of different reflection surfaces on the imaging effect of optical system was analyzed.The ellipsoidal shape can obtain a smaller value of evaluation function,and meet the optical design requirements of corneal topography.Compared with flat ellipsoid,sphere and paraboloid,long ellipsoid is more suitable as the reflection surface of corneal topography based on Placido.
作者
张培茗
王迎
王琦
刘杨
蒋海洪
张天逸
王成
ZHANG Peiming;WANG Ying;WANG Qi;LIU Yang;JIANG Haihong;ZHANG Tianyi;WANG Cheng(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Medical Instrument,Shanghai University of Medicine&Health Sciences,Shanghai 201318,China)
出处
《光学技术》
CAS
CSCD
北大核心
2023年第5期528-533,共6页
Optical Technique
基金
上海浦江人才项目(21PJD048)。
关键词
角膜地形图
成像光学
波像差
非球面优化
遗传算法
corneal topography
imaging optics
wave aberration
aspheric surface optimization
genetic algorithm
