用于视网膜疾病筛查的基于低成本智能手机的便携式数字眼底相机系统的光学原理与应用
Optics and Utility of Low-Cost Smartphone-Based Portable Digital Fundus Camera System for Screening of Retinal Diseases.
作者信息
Chalam K V, Chamchikh Joud, Gasparian Suzie
机构信息
Department of Ophthalmology, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA.
出版信息
Diagnostics (Basel). 2022 Jun 20;12(6):1499. doi: 10.3390/diagnostics12061499.
PURPOSE
To describe optical principles and utility of inexpensive, portable, non-contact digital smartphone-based camera for the acquisition of fundus photographs for the evaluation of retinal disorders.
METHODS
The digital camera has a high-quality glass 25 D condensing lens attached to a 21.4-megapixel smartphone camera. The white-emitting LED light of the smartphone at low illumination levels is used to visualize the fundus and limit source reflection. The camera captures a high-definition fundus (5344 × 4016) image on a complementary metal oxide semiconductor (CMO) with an area of 6.3 mm × 4.5 mm. The auto-acquisition mode of the device facilitates the quick capture of the image from continuous video streaming in a fraction of a second.
RESULTS
This new smartphone-based camera provides high-resolution digital images of the retina (50° telescopic view) in patients at a fraction of the cost (USD 1000) of established, non-transportable, office-based fundus photography systems.
CONCLUSIONS
The portable user-friendly smartphone-based digital camera is a useful alternative for the acquisition of fundus photographs and provides a tool for screening retinal diseases in various clinical settings such as primary care clinics or emergency rooms. The ease of acquisition of photographs from a continuously streaming video of fundus obviates the need for a skilled photographer.
目的
描述一种基于智能手机的廉价、便携式非接触式数字相机的光学原理及用途，该相机用于获取眼底照片以评估视网膜疾病。
方法
该数字相机有一个高质量的25D玻璃聚光镜，连接到一部2140万像素的智能手机相机上。智能手机在低光照水平下发出的白色LED光用于观察眼底并限制光源反射。相机在面积为6.3毫米×4.5毫米的互补金属氧化物半导体（CMOS）上捕捉高清晰度的眼底（5344×4016）图像。该设备的自动采集模式有助于在几分之一秒内从连续视频流中快速捕捉图像。
结果
这种新型的基于智能手机的相机能为患者提供视网膜的高分辨率数字图像（50°望远镜视图），而成本仅为已有的、不可移动的、基于办公室的眼底摄影系统的几分之一（1000美元）。
结论
这种便携式、用户友好的基于智能手机的数字相机是获取眼底照片的一种有用替代方案，并为在各种临床环境（如基层医疗诊所或急诊室）中筛查视网膜疾病提供了一种工具。从眼底连续视频流中轻松获取照片消除了对熟练摄影师的需求。
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