An Overview on the Use of a Low Magnification Telescope in Low Vision
An Overview on the Use of a Low Magnification Telescope in Low Vision
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低倍率望远镜在弱视中的使用概述
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
G. Woo
中科院分区：
文献类型：
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作者：
G. Woo
最简单形式的伽利略望远镜是一个两元件系统，由作为物镜的正透镜和作为目镜的负透镜组成。与开普勒望远镜相比，该系统的放大倍数较低，视场较小。然而，通过系统的图像始终是直立的，允许其用于弱视患者的远距离观看。除了放大倍率和视场之外，需要考虑的其他光学因素包括出瞳尺寸、焦点可调性、顶点距离以及颜色和亮度方面的图像质量。重量、便携性、易用性、外观和成本等非光学因素也是影响变量[1]。在本篇关于低倍望远镜在检查室的临床使用的概述中，仅检查少数属性。将讨论低倍全视场望远镜在主观和客观折射中的使用。还将详细阐述通过望远镜的放大倍数。
A Galilean telescope in its simplest form is a two element system consisting of a positive lens as an objective and a negative lens as an eyepiece. The system is restricted to lower magnifications and smaller fields of view in comparison with a Keplerian telescope. The image through the system, however, is always erect permitting its use for distance viewing for partially sighted patients. Other optical factors besides magnification and field of view that need to be considered include exit pupil size, focus adjustability, vertex distance, and image quality in terms of color and brightness. Such non optical factors as weight, portability, ease of use, appearance and cost are also influencing variables [1]. In this overview on the clinical use of low power telescopes in the examination room, only a few properties will be examined. The use of a low power full-field telescope in subjective and objective refractions will be discussed. Magnification through a telescope will also be elaborated upon.