Patent · US Active

Toric contact lens with improved posterior surface design

US7625085B2 · kind B2 · utility

2Cited by

19References

24Claims

0Family size

Assignee

Novartis AG · CH

Inventors

Ming Ye · Fort Worth, US
Curtis Dean McKenney · Duluth, US

Key dates

Filing date	Aug 5, 2008
Grant date	Dec 1, 2009
Priority date	—
Expiry date	Aug 5, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/044
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Ophthalmic lenses for correcting astigmatism having a posterior surface with a central optic zone, a peripheral zone, and a blending zone therebetween. The surface of the central zone may be asphero-toric and the surface of the peripheral zone aspheric, with these flatter slopes smoothening out the transition between the central and peripheral zones. The blending zone gradually transitions the curvatures of the central and peripheral zones to further smoothen out the central-to-peripheral-zone transition.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.