基于眼模型的便携式眼底荧光相机设计

Design of a Portable FFA Camera Based on the Eye Model

设计了一款基于Gullstrand-Le Grand眼模型的便携式眼底荧光相机.该相机选用Nikon公司的B-2A滤光组合作为滤光系统,综合考虑了人眼光学结构和外部系统的像差进行综合设计,实现了全视场200万像素的高清晰成像.采用环形光阑和共轴式照明相结合的照明方式,获得了眼底均匀照明.结果显示:本相机具有较大的调节能力,对-10D～+8D人眼普遍适用,其视场角为30°,像面成像分辨率为120lp/mm,负畸变值小于5.3%.

A portable fundus fluorescein angiography（FFA）camera is designed based on Gullstrand-Le Grand eye model.Nikon filter combination of B-2A is used as filter system in this design.And after the comprehensive consideration of both the optical system of human eye and the camera,a high definition image with 2 mega pixels in its full field of view is realized.Meanwhile,the coaxial illumination system is designed with an annular stop,in order that the eyeground is uniformly illuminated.It is shown that this camera has strong abilities for accommodation,which could adapt the different eyes from -10D to ＋8D.The field of view of this camera is 30°,the resolution of the image surface is 120 lp/mm,and the value of the negative distortion is less than 5.3%.