Ophthalmic lens having an optical zone blend design
US7004585B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 2004 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Jan 28, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An ophthalmic lens, such as multifocal contact lens, that is worn on the surface of the eye and has a blended design for a segmented optical zone. The lens has an anterior surface and an opposite posterior surface, wherein the anterior surface includes a vertical meridian, a horizontal meridian, a central optical zone having at least a first optical zone for primary gaze, a second optical zone for down-gaze and an optical blending zone between the first and second optical zones. The optical blending zone has a surface that ensures a smooth surface transition from the first optical zone to the second optical zone and that allows the first and second optical zone to be designed independently and optimally so that ghost images or blur from the transition between the first and second optical zones can be minimized or eliminated. Image blur from the blend zone that subtends the pupil is minimized by the magnitude of the curvature of the blend zone. The optical zones will have the optimal aberration parameters to control vision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.