第18卷第7期 2010年7月
文章编号1004-924X(2010)07-1511-09
光学精密工程
Optics and Precision Engineering
Vol.18No.7
Jul.2010
基于眼模型的非球面眼底荧光相机的设计
王肇圻，王尧，全薇
（南开大学现代光学研究所光电信息技术科学教育部重点实验室，天津300071）
摘要：运用非球面光学理论，设计了一款基于Gullstrand-LeGrand眼模型的便携式非球面眼底荧光相机。该相机根据滤光片选择原则，选用Nikon公司的B-2A滤光组合作为滤光系统进行光谱滤光；为避免角膜中心较大曲率引起的杂放光，采用环形光和共轴式照明相结合的照明方式实现眼底均匀照明；摄影系统中引人眼模型结构，综合校正了人眼及系统的像差，实现了全视场20×10°pixel的高清晰成像。该摄影系统包含有2个非球面结构，使系统由9片镜结构简化为了片镜结构。实验结果表明，该相机具有较大的调节能力，对一12～十
十12m-"的人眼普遍适用，其视场角为30*，像面成像
分辨率为120lp/mm，畸变值<3.9%。非球面光学元件的使用，有效地简化了系统，减小了系统体积和重量，提高了成像质量。
关键
词：光学设计；眼底荧光造影；相机；眼模型；非球面
中图分类号：TH703;TB853.9
文献标识码：A
doi;10.3788/OPE.20101807,1511
Design of asphericFFA camerabased on eyemodel
WANG Zhao-qi,WANG Yao,QUAN Wei
(KeyLaboratory of OptoelectronicInformationScienceand Technology,
MinistryofEducation,InstituteofModernOptics，NankaiUniversity,Tianjin300071,China) Abstract: By use of aspheric optical elements,a portable Fundus Fluorescein Angiography(FFA) camera is designed based on Gullstrand-Le Grand eye model. According to the principle of selecting filter, a B-2A filter combination from Nikon is used as the filter system to filter spectrum in this design, and the coaxial illumina tion system combined with an annular stop is designed to remove the stray light caused by a cornea to light the eyeground uniformly. An eye model is used in the design of photographic system to correct comprehensive ab-errations from both the optical systems of human eye and the camera and to realize a high definition image with 2 mega pixels in all fields of view. The photographic system of the camera includes two aspheric surfaces, and it reduces the system from 9 lenses to 7 lenses, The result shows that this camera has strong ability for accommodation and adapts to different eyes from -12 m1 to +12 m1, The field of view of this camera is 30°, the resolution at the image surface is 120 lp/mm, and the distortion value is less than 3. 9%. Because of the application of aspheric elements, the structure, volume and weight of the camera are optimized, and the image quality is improved.
Key words: optical design; Fundus Fluorescein Angiography(FFA); camera;eye model; aspheric sur
face
收稿日期：2009-09-01；修订日期：2009-11-16.
基金项目：国家自然科学基金资助项目（No.60978068；No,60777011）