Opthalmic lenses having reduced base out prism

Details Opthalmic lenses having reduced base out prism Opthalmic lenses having reduced base out prism

2009-03-24

2011-10-25

Schwartz, Jordan (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S170000, C351S177000

Reexamination Certificate

active

08042940

ABSTRACT:
The invention generally relates to a lens and the method of manufacturing progressive addition lenses (PAL) to remove unwanted base out prism and minimize excessive convergence, comprising determining basic configuration of two major lens surfaces to provide a distance portion and near portion, wherein diopter power increases from the distance portion of the lens to the near portion; selecting an amount of prism reduction; and reducing base out prism that inherently occurs as diopter power increases by altering the configuration of the lens as a function of the amount of prism reduction to minimize any disruption of optical properties a lens while decreasing base out prism.

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Teitelbaum, Pang and Krall, “Effectiveness of Base in Prism for Presbyopes with Convergence Insufficiency”, Optometry and Vision Science, vol. 86, No. 2, Feb. 2009, pp. 153-156.

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