Resin ophthalmic lenses having a prismatic segment

Details Resin ophthalmic lenses having a prismatic segment Resin ophthalmic lenses having a prismatic segment

G - Physics

02

C

88/38

G02C 7/02 (2006.01)

Patent

CA 1113755

ABSTRACT A cast resin ophthalmic lens comprises a homogeneous body defined of cured optical casting resin. The body has a cast optically finished front surface composed of a major surface portion and a minor surface portion. The minor surface portion defines in the front surface, in a selected localized area thereof, a lens segment having a predeter- mined prismatic optical effect. The major surface portion is a portion of a surface of revolution having a first axis of symmetry and having an effective center of curvature therealong. The minor surface portion is a portion of a surface of revolution having a second axis of symmetry. The first and second axes of symmetry intersect, if at all, at a location on the first axis other than at substantially the center of curvature of the major surface portion.

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