摘要
基于自适应光学设计了一款可诱导人眼自动调焦的眼底相机,包括视度调节系统、照明系统和自适应成像系统。在视度调节系统中,通过设置视标诱导人眼自动调焦,校正人眼初级像差,将人眼残余像差控制在自适应成像系统的校正范围内。在照明系统中,采用轴锥镜组产生环形光照明人眼,消除人眼角膜的强反射光,通过调节轴锥镜之间的距离使环形光束内径连续变化以适应不同的人眼。在自适应成像系统中,使用哈特曼-夏克波前传感器作为波前探测器,使用变形镜作为波前校正器,校正人眼的高阶像差。仿真结果表明,眼底照明均匀度可达95%,自适应成像系统在截止频率76lp/mm处,各视场调制传递函数(MTF)值均大于0.36。系统畸变小于1%,能够对在-6 D^+8 D(D表示屈光度数)之间的人眼眼底清晰成像。
An inducible human eye accommodation fundus camera based on adaptive optics （AO） is designed, including diopter adjustment system, illumination system and the AO imaging system. By setting a target, the diopter adjustment system induces human eye accommodation and corrects primary aberration to make the residual aberration in the range of correction of AO imaging system. To eliminate the strong stray light caused by a cornea and to illuminate the eyeground uniformly, double-axicon is used to generate annular beam that the inner diameter can be changed continuously by adjusting the distance between axicon-lens to accommodate different eyes. Hartmann-Shack wavefront sensor is used as wavefront detector and deformable is used as mirror as the wavefront corrector in the AO imaging system. Simulation results show that the illumination uniformity at the fundus is up to 95%，and the modulation transfer function of every field is greater than 0.36 at cut-off frequency of 76 lp/mm with the distortion less than 1%. The system design meets the requirement and can image eyeground clearly on the condition that diopter ranges from -6D to ＋8D.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第4期211-217,共7页
Acta Optica Sinica
基金
国家自然科学基金(41104122)
中国与白俄罗斯国际科技合作计划(2011DFR10010)
作者简介
李春才（1988-），男，博士研究生，主要从事光学设计方面的研究。E-mail：leeccai@sina．com
导师简介：巩岩（1968-），男，博士，研究员，主要从事短波光学、光学系统设计和成像光谱技术等方面的研究。E-mail：gongvr@sklao．ac．cn
