Bipolar progressive-power ophthalmic lens

Details Bipolar progressive-power ophthalmic lens Bipolar progressive-power ophthalmic lens

G - Physics

02

C

88/101, 88/38

G02C 7/02 (2006.01)

Patent

CA 1299400

26920A ABSTRACT OF THE DISCLOSURE 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 mathematical 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 rela- tive 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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