Bifocal contact lens with secondary prism
US6746118B2 · kind B2 · utility
7Cited by
28References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Jul 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/048
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A soft prism bifocal contact lenses that provides optimal vision for both distance and near objects by incorporating two or more prisms into the same lens. One or more primary prisms are used to achieve a desired vertical lens positioning on the eye and to control meridional rotation. In addition, one or more secondary prisms are used to achieve vertical lens shifting so that the desired optical power zone of the contact lens is brought before the entrance pupil of the eye at the desired time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.