面向中距衍射多焦点人工晶状体设计

李季; 薛常喜

doi:doi:10.3788/gzxb20184709.0922001

光子学报, 2018, 47 (9): 0922001, 网络出版: 2018-09-15

面向中距衍射多焦点人工晶状体设计

Design for Mid-range Diffraction Multifocal Intraocular Lens

论文大纲

李季 ^*薛常喜

作者单位

长春理工大学光电工程学院, 长春 130022

光学设计几何光学衍射非球面人工晶状体 Optical design Geometric optics Diffraction Aspherics Intraocular lenses

摘要

运用ZEMAX光学设计软件基于Liou-Brennan眼模型, 材料选用疏水性丙烯酸酯, 设计了前表面为衍射面, 后表面为非球面的多焦点人工晶体, 该设计利用0级、+1级衍射级次, 当物在不同位置时, 使不同衍射级次发挥作用.对于所设计的人工晶体, 采用的附加光焦度为1.66 D, 即两个焦点处的光焦度分别对应20 D、21.66 D, 小附加光焦度的确立旨在着重优化人工晶状体在中距处的光学质量.首先基于衍射光学理论计算衍射面的衍射效率, 利用ZEMAX光学设计软件得到衍射面及非球面的光学参数, 继而利用MATLAB模拟仿真软件模拟衍射面位相结构及实际表面轮廓, 最后利用单点金刚石超精密车床对所设计的人工晶体进行加工, 根据实测光学调制传递函数分析所设计的人工晶体的光学质量并利用实测离焦量曲线验证附加光焦度的正确性.该设计满足光学调制传递函数在空间频率50 lp/mm处大于0.3, 可为白内障患者在不同距离视物提供较好的视觉清晰度.新型人工晶体应用于物距为75.3 cm的工作距离, 为小附加光焦度人工晶体应用领域提供理论及实验基础.

Abstract

The Liou-Brennan (L-B) eye model is constructed using the optical design software ZEMAX. The material of Intraocular Lens (IOL) is hydrophobic acrylate. A multifocal intraocular lens with a diffractive surface on the anterior surface and an aspherical surface on the anterior surface is designed. The design uses 0th order and +1 order of diffraction. When the object is in different positions, different diffraction orders play a role. For the designed IOL, the additional optical power is 1.66 D, the optical powers of the two focal points are correspond to 20 D and 21.66 D respectively. The establishment of small additional power aims to focus on optimizing the optical quality of the intraocular lens at the mid-distance. Firstly, the diffraction efficiency of the diffractive surface is calculated based on the theory of diffractive optics. The optical parameters of the diffractive surface and the aspherical surface is obtained by ZEMAX optical design software. Then the phase structure and the actual surface profile of the diffractive surface are simulated by MATLAB simulation software. Finally, The designed IOL is processed by a single point diamond lathe. According to the measured optical Modulation Transfer Function (MTF) The optical quality of the designed IOL is analyzed and the correctness of the additional optical power is verified by the measured defocus curve. The design meets the optical modulation transfer function (MTF) at 50 lp/mm greater than 0.3, which provides better visual clarity for cataract patients for different distances. The new type of intraocular lens uses in the working distance of 75.3 cm, providing theoretical and experimental basis for the application of small additional power intraocular lens.

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李季, 薛常喜. 面向中距衍射多焦点人工晶状体设计[J]. 光子学报, 2018, 47(9): 0922001. LI Ji, XUE Chang-xi. Design for Mid-range Diffraction Multifocal Intraocular Lens[J]. ACTA PHOTONICA SINICA, 2018, 47(9): 0922001.

面向中距衍射多焦点人工晶状体设计

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