Series of aspherical contact lenses
US7380937B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2005 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Sep 2, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/22
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a series of aspherical contact lenses, each lens having a first central optical zone on its anterior surface and a second central optical zone on its posterior surface. Both central optical zones are aspherical surfaces. The first central optical zone is designed to have a surface which provides a target optical power and an optical power profile selected from the group consisting of (1) a substantially constant optical power profile, (2) a power profile mimicking the optical power profile of a spherical lens with an identical targeted optical power, and (3) a power profile in which lens spherical aberration at 6 mm diameter is from about 0.65 diopter to about 1.8 diopters more negative than spherical aberration at 4 mm diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.