Artificial eye lenses
US4642112A · kind A · utility
202Cited by
7References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1982 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Apr 14, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A contact lens has a transmission hologram which provides diffractive power on a wavelength and/or amplitude selective basis whereby light from near and distant objects can be focussed on the retina of a presbyopic wearer. Similarly an implant lens can have a transmission hologram to correct for non-accommodative vision. The invention is particularly useful in providing an artificial eye lens with a bi-focal action without need for distinct near and far vision zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.