Multifocal contact lens and method for preparing
US5526071A · kind A · utility
40Cited by
12References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1994 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Feb 25, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/043
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hydrophilic multifocal contact lens customized for a patient comprises, in accordance with the present invention, (i) an anterior surface having at least two annular aspheric surfaces, each of said annular aspheric surfaces having standard eccentricity values ranging from about 0.4 to about 1.8, said surfaces differing in eccentricity value from about 0.2 to about 0.8, (ii) a concave posterior cornea-fitting surface having at least one spherical or aspheric surface, and optionally, (iii) an edge radius at the annular periphery of said posterior surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.