Borish I M, Soni S
J Am Optom Assoc. 1982 Mar;53(3):219-29.
A brief description of the construction and optical behavior of three general forms of hard contact lens bifocals are described. Each is considered from the standpoint of essential fitting criteria and brief techniques and qualifications affecting potential success are noted. The authors' technique utilized over many years of fitting segmented forms of contact lens bifocals is described in detail. Applications of principles affecting positioning and rotation of such lenses associated with edge design and lid action are noted. A simple clinical technique for determining appropriate segment height and position and viability of segment translation a priori to ordering contact lenses is described. Summarization indicates that common principles apply to all forms varied only by aspects of the individual constructions, and that these principles may also apply to the newly presented soft contact lens versions of bifocals.
本文描述了三种常见形式的硬性隐形眼镜双焦点镜片的构造及光学特性。从基本的配镜标准角度对每种镜片进行了考量，并指出了影响潜在成功率的简要技术和条件。详细介绍了作者多年来在验配分段式隐形眼镜双焦点镜片时所采用的技术。文中提到了与镜片边缘设计和眼睑活动相关的影响此类镜片定位和旋转的原理应用。还介绍了一种简单的临床技术，用于在订购隐形眼镜之前预先确定合适的分段高度、位置以及分段平移的可行性。总结表明，通用原则适用于所有形式的镜片，只是在个别构造方面有所不同，并且这些原则可能也适用于新推出的软性隐形眼镜双焦点镜片版本。
