摘要
基于Gullstrand-Le Grand眼模型设计了一款便携式双波段眼底造影仪的光学结构。考虑人眼光学系统的像差并使用共轴式照明,设计了在主波段525和826 nm下全视场200万像素高清晰成像的光学系统,该系统可实现吲哚菁绿血管造影和荧光眼底血管造影两种方式成像。为了避免角膜中心具有大曲率而引入杂散光,照明系统采用环形光阑、中空反射镜和共轴式照明相结合的方法。为了达到系统的便携性和成像清晰性,在摄影系统中加入两个非球面结构。实验结果表明:本系统具有较大的调节能力,对-10 m-1～+8 m-1人眼普遍适用,系统可实现30°的眼底拍摄,眼底分辨率>108 lp/mm,畸变<10%,达到了便携式双波段眼底造影仪的使用要求。
An optical system of portable fundus angiography in dual-bands is designed based on the Gull- strand-Le Grand eye model. By considering the human vision system and applying the coaxial illumination, the apparatus with 2 mega pixels in all fields of view is designed, which can be used in Fundus Fluorescein Angi- ography（FFA） and Indocyanine Green Angiography（ICGA） under the wave bands of 525 nm and 826 nm. An annular diaphragm, a hollow mirror and a coaxial illumination are adopted in the illuminating system to a- void the stray light caused by the reflection of the corneal surface. Furthermore, two aspheric surfaces are in- volved in order to simplify the photographic system. The result shows that with a larger accommodation, this system can adapts to human eyes from -10 m-1 to ＋8 m-1. With the field of view of 30°, the resolution of the eyeground over 108 lp/mm, and the distortion value less than 10% the system can satisfy the requirements as a portable dual-band imaging instrument.
出处
《中国光学》
EI
CAS
2013年第2期223-230,共8页
Chinese Optics
基金
国家自然科学基金资助项目(No.60978068)
关键词
医疗器械
眼底造影
眼模型
非球面
medical equipment
fundus angiography
eye model
aspheric surface
