可变焦距透镜和新型折射仪的研发。

J Am Optom Assoc. 1978 Jan;49(1):24-9.

This paper traces the events that led to the development of the variable-focus lens, the variable-power astigmatic lens, and the principle of remote refraction and "phantom lenses." These developments formed the basis for invention of a new subjective refractor-the Vision Analyzer- whose novel design and rapid operation are described.

本文追溯了导致可变焦距透镜、可变焦散光透镜以及远距验光原理和“虚拟透镜”发展的一系列事件。这些发展构成了一种新型主观验光仪——视觉分析仪发明的基础，文中描述了该仪器的新颖设计和快速操作。