基于眼模型的数字眼底相机设计

本文基于Gullstrand-Le Grand眼光学模型设计了一个视场角为30°免散瞳手持式的数字眼底相机，在综合考虑人眼本身和外部系统的像差后，实现了全视场200万像素的高清晰眼底成像；引入眼模型辅助设计，解决了人眼自身的色差问题，从而适用于白光照明。同时，为避免角膜中心曲率大的区域反射引入杂散光，专门设计了环形光阑和共轴照明相结合的照明系统。结果显示，该相机系统成像分辨率高于120lp/mm，场曲值小于0.86mm，畸变仅为7.2%，并且具有较大调焦能力，对-10D至7D屈光度人眼普遍适用。

Design of a digital retina camera based on the eye model

A portable digital retina camera in 30 field of view without mydriatic is designed based on Gullstrand-Le Grand eye model. After the comprehensive consideration of both the human eye and the camera, this design realizes the highly clear image with 2 mega pixels in all fields of view. And an eye model is used in this design to diminish the chromatic aberration brought by the human eyes themselves, so that the camera could use in the visible band. Meanwhile, in case of the stray lights caused by the cornea, the illuminating system with an annular stop and coaxial illumination is specially designed. The result shows that the resolution of this system is 120lp/mm, the field curve value is less than 0.86mm and the distortion value is only 7.2%, and this camera has strong abilities for accommodation, which could adapt the different eyes from -10D to 7D.