Rotationally stable contact lens designs
US5650837A · kind A · utility
78Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | May 4, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/048
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Non-ballasted, eyelid rotationally stabilized designs are disclosed for use in toric or multifocal toric contact lenses. The back surface of the lens includes a toric or multifocal toric surface and also thin top and bottom zones (slab offs) to achieve eyelid rotational orientation and stabilization. The advantage of this technical approach is in mold manufacturing, wherein the design allows the use of any chosen power spherical stock front mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.