Method of manufacturing a segmented multifocal ophthalmic lens
US5507979A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1994 |
| Grant date | Apr 16, 1996 |
| Priority date | — |
| Expiry date | Aug 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of making multifocal refractive contact lens to focus light on the retina of the eye uses a plurality of at least two of each alternating segments having different optical powers for distance vision and for near. The lens of the invention does not require orientation to produce adequate far and near vision and normal steroscoptic effect. One or both of the segments having the optical powers may have aspherical lens surface. Preferably, the lens has at least one aspherical lens surface and the segments are divided by an arcuate path going from the center of the lens to edge. Such a lens is manufactured by taking lens molds and cutting the molds from the edge through the center to the opposite edge along a predetermined path. The molds are cut so that the segments produced are interchangable and can be fitted together to make a mold that can produce the multifocal refractive contact lens by molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.