Multifocal lens having a progressive optical power region and a discontinuity
US7883206B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2007 |
| Grant date | Feb 8, 2011 |
| Priority date | — |
| Expiry date | Apr 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Embodiments of the present invention relate to a multifocal lens having a mostly spherical power region and a progressive optical power region. Embodiments of the present invention provide for the proper alignment and positioning of each of these regions, the amount of optical power provided by each of the regions, the optical design of the progressive optical power region, and the size and shape of each of the regions. The combination of these design parameters allows for an optical design having less unwanted astigmatism and distortion as well as both a wider channel width and a shorter channel length compared to conventional PALs. Embodiments of the present invention may also provide a new, inventive far-intermediate distance zone and may further provide for increased vertical stability of vision within a zone of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.