Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1987-12-10
1989-08-29
Arnold, Bruce Y.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
048611530
ABSTRACT:
In the embodiments of the bipolar progressive power ophthalmic lens described in the specification, the constant power distance portion and reading portion regions of the progressive power surface are reduced to mathemtical points and the surface astigmatism aberration is reduced to a minimum level by spreading it over a maximally large area of the lens. The points are the poles of a bipolar system of isopower contours and the entire progressive surface is swept out by the curve of intersection formed between a sphere of variable radius and a corresponding circular cylinder of variable diameter with the dimensions of relative positions of intersecting sphere and cylinder chosen so as to produce a gently curving surface to provide a smooth optical effect.
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American Optical Corporation
Arnold Bruce Y.
Sugarman Scott J.
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