Toric contact lenses with controlled optical power profile
US7497572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2007 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Aug 29, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a toric contact lens having a controlled optical power profile. In addition, the invention provides a series of toric contact lenses, each having a series of different targeted cylindrical optical powers and a series of different targeted spherical optical powers, and each having a spherical aberration profile in which (1) the optical power deviations of the lens are substantially constant; (2) power deviation at a distance of 3 mm from the optical axis is from about −0.5 diopter to about −1.5 diopters; (3) power deviation at a distance of 3 mm from the optical axis is from about 0.2 diopter to about 1.0 diopter smaller than power deviations at a distance of 2 mm from the optical axis; or (4) there is a spherical aberration component described by any one of fourth order, sixth order, eighth order Zernike spherical aberration-like terms, or combination thereof, wherein the spherical aberration component has a value of −0.5 diopter to about −1.5 diopters at a distance of 3 mm from the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.