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Method of producing a spherical power multifocal ophthalmic lens for correcting an astigmatic presbyopic eye

机译:生产用于矫正散光老花眼的球面多焦点多焦点眼镜片的方法

摘要

Concentric lens designs are disclosed for astigmatic presbyopes which comprise at least one surface which has a circular central portion and a plurality of concentric annular rings with at least three separate optical powers corresponding to a prescription for a patient and corresponding to 1) a basic distance spherical prescription Rx, 2) a near add spherical prescription Rx, and 3) a spherical prescription corresponding to the full, or preferably a fraction of the, cylindrical prescription Rx. An astigmatic presbyopic prescription contains an astigmatic correction, normally in the nature of a cylindrical prescription which specifies both the cylindrical optical power and the orientation of the cylindrical axis. The cylindrical prescription is taken into account in the design of the lens, but not with a cylindrical optical surface. Instead, the present invention recognizes that the brain can effectively discriminate between separate competing images by accepting an in-focus image and rejecting an out-of-focus image. Accordingly, a portion of the lens is provided with a spherical surface corresponding to the cylindrical prescription, or more preferably a fraction of the full cylindrical prescription, and the brain is relied upon to discriminate and accept an in-focus image to compensate for the patient's astigmatism.
机译:公开了一种用于散光老花眼的同心透镜设计,其包括至少一个表面,该表面具有圆形的中心部分和多个同心的环形环,所述至少两个同心的环形具有至少三个分别的屈光力,对应于患者的处方并且对应于1)基本距离球面处方Rx,2)近似于加法的球形处方Rx,和3)对应于全部或优选一部分圆柱形处方Rx的球形处方。散光老花处方包含散光矫正,通常以柱面处方的性质进行,它指定了柱面屈光力和柱面轴的方向。镜片的设计要考虑到圆柱面的处方,但不考虑圆柱面的光学表面。而是,本发明认识到,大脑可以通过接受聚焦图像并拒绝聚焦图像来有效地区分单独的竞争图像。因此,晶状体的一部分具有与圆柱体处方相对应的球面,或更优选地为整个圆柱体处方的一部分,并且依靠大脑来辨别并接受对焦图像以补偿患者的视力。散光。

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