Contact lens wherein central correction region has a center 0.2-2.4mm offset from lens geometric center and a diameter of 0.8-3.5mm
US5422687A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1994 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Mar 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A presbyopia correction contact lens to be used in contact with a cornea of an eye of a wearer, the contact lens having a substantially circular central correction region and an annular outer correction region which surrounds the central correction region, the central and outer correction regions providing one and the other of a near vision correction region and a distance vision correction region, respectively, wherein the central correction region has a center which is offset by a distance of 0.2 mm-2.4 mm from a geometric center of the contact lens toward a side portion of the lens, which side portion is to be located on the side of the nose of the wearer when the contact lens is used in contact with the cornea, and the central correction region has a diameter within a range of 0.8 mm-3.5 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.