Resin ophthalmic lenses having a prismatic segment
US4288149A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1978 |
| Grant date | Sep 8, 1981 |
| Priority date | — |
| Expiry date | Feb 24, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/06
- WIPO fieldOptics
- WIPO sectorInstruments
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 predetermined 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.