Multifocal intraocular lenses fabricated from media exhibiting tuned birefringence.
Multifocal intraocular lenses fabricated from media exhibiting tuned birefringence.
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由具有调谐双折射的介质制成的多焦点人工晶状体。
DOI：
10.1097/00006324-199204000-00013
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
W. Fiala
中科院分区：
文献类型：
--
作者：
W. Fiala
双折射镜片同时提供两种屈光力。一种光焦度由寻常光线提供，另一种光焦度由通过透镜的非常光线提供。因为当与平均透镜屈光力相比时，眼内透镜的阅读屈光力和远距屈光力之间的差异很小，所以双折射眼内透镜的非常折射率和普通折射率之间的差异也可以很小。它表明，一个单一的双折射人工透镜，它是由一个适当取向的聚合物透镜材料制造提供了两个权力所需的远距离观看和阅读。由M个双折射透镜部件组成的复合透镜在期望的间隔内提供高达2M的屈光力。对于在期望的间隔内选择功率值以及对于与各个功率相关联的强度，存在自由度。
Birefringent lenses provide two simultaneous powers. One power is provided by ordinary rays, the other by extraordinary rays through the lens. Because the difference between the reading and distance powers of intraocular lenses is small when compared to the average lens power, the difference between the extraordinary and the ordinary index of refraction of birefringent intraocular lenses can also be small. It is shown that a single birefringent intraocular lens which is manufactured from a properly oriented polymeric lens material provides the two powers needed for distant viewing and reading. Compound lenses consisting of M birefringent lens components provide up to 2M powers within a desired interval. Degrees of freedom exist for the choice of power values inside the desired interval and for the intensities associated with the individual powers.