G - Physics – 02 – C
Patent
G - Physics
02
C
G02C 7/06 (2006.01) A61F 2/16 (2006.01) G02C 7/04 (2006.01)
Patent
CA 2175649
Multifocal concentric annular ring lens designs are disclosed with minimal angles between adjacent annular ring segments. The present invention relates in particular to spheric lens designs having different radii of curvature, which enable a numerically controlled (NC) machine to be programmed to machine the adjacent annular segments and the transitions therebetween. A multifocus, concentric annular ring lens has either a front or back surface which defines a plurality of spherical annular rings having different spherical optical powers with different spherical radii. Pursuant to the teachings of the present invention, the radius of curvature of a first spherical annular ring is displaced along the longitudinal optical axis of the lens relative to the radius of curvature of an adjacent second spherical annular ring. The radii of curvature of the first and second spherical annular rings intersect at a junction whereat the angular difference between tangents thereto at the junction defines a minimal angle to provide a lens having improved wearing comfort and physiological acceptability.
Lewis Yulin X.
Roffman Jeffrey H.
Johnson & Johnson Vision Products Inc.
Swabey Ogilvy Renault
LandOfFree
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