Bergenske P D, Raasch T W
Am J Optom Physiol Opt. 1982 Mar;59(3):283-6. doi: 10.1097/00006324-198203000-00014.
This report describes the design of a variable focus telescopic system for a low vision patient who wanted to be able to see at numerous fixed working distances. A simple and effective means of mounting the telescope onto an existing spectacle lens is described. The discussion presents an analysis of the optical principles used and a formula for determining the equivalent power of a nearpoint telescope.
本报告描述了一种可变焦距望远系统的设计，该系统用于一位希望能够在多个固定工作距离看清物体的低视力患者。文中介绍了一种将望远镜安装到现有眼镜镜片上的简单有效方法。讨论部分对所使用的光学原理进行了分析，并给出了一个用于确定近点望远镜等效屈光力的公式。
