设计了一个视场角为30°的免散瞳立体成像眼底相机的光学系统。系统由成像系统和照明系统组成,在成像系统中,设计了新型眼底立体成像光学结构,并加入前置物镜来提高成像分辨率;在照明系统中,通过设置环形光阑来避免角膜反射光的产生,并加入黑点板来消除网膜物镜产生的杂散光。研究结果表明,该系统不仅可以实现眼底视网膜图像的多角度同步采集,还可以实现眼底视网膜6×10 ⁶ pixel的高清成像。系统对正常人眼的物方分辨率高于200 lp/mm,系统总长为290 mm,场曲值小于28 μm,畸变仅为-4.9%。系统具有较强的调焦能力,能对-7~+5 m ^-1屈光度人眼的眼底进行清晰成像。

An optical system for the non-mydriatic stereoscopic imaging fundus camera with a field of view of 30° is designed, which is composed of an imaging system and an illumination system. In the imaging system, a new optical structure for the stereoscopic imaging of fundus is designed, in which a prefixing objective lens is introduced to improve the imaging resolution. In the illumination system, an annular aperture is introduced to avoid the generation of the corneal reflected light and the black spot plates are adopted to eliminate the stray light produced by the ophthalmic lens. The research results show that, this system can be used to achieve not only the multi-angle synchronous acquisition of the retina images, but also the highly clear imaging of the fundus with 6×10 6 pixel. As for this system, the object resolution of the normal human eyes is higher than 200 lp·mm -1. This system has an overall length of 290 mm, a field curve value of smaller than 28 μm, and a distortion value of only -4.9%. This system has a strong focusing ability and the human fundus with a diopter range of -7-+5 m -1 can be imaged clearly.