Lens design to enhance vision quality
US6695449B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Oct 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A contact lens includes a central zone and a peripheral zone. The central zone extends radially from a center to a central intermediate edge and has a radius corresponding to a radius of a contracted pupil of a user when subjected to a high ambient light condition. The central zone also has a constant first refractive power across the central zone. The peripheral zone extends radially from the central intermediate edge to an outer edge and has a radius corresponding to a dilated pupil of the user. The peripheral zone has a refractive power that is equal to the first refractive power at the intermediate edge and that increases radially to a second refractive power, different from the first refractive power, at the outer edge. The contact lens also includes a non-optical zone that extends radially from the outer edge to an outermost radius corresponding to a radius of a user's cornea.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.