Multifocal ophthalmic lens
US5225858A · kind A · utility
299Cited by
68References
34Claims
0Family size
Inventor
Key dates
| Filing date | Jun 18, 1991 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Jun 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/044
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multifocal ophthalmic lens adapted for implantation in the eye or to be disposed on or in the cornea. The lens has an optical axis, a central zone and a plurality of annular zones circumscribing the central zone. Two of the annular zones have a first region with a far vision correction power and a second region with a near vision correction power. In an IOL embodiment, the vision correction power between far and near is progressive, and each of the second regions has a major segment in which the near vision correction power is substantially constant. The power in the central zone varies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.