Patent · US Expired

Aspherical diffractive ophthalmic lens

US7073906B1 · kind B1 · utility

189Cited by
3References
31Claims
0Family size

Inventor

Key dates

Filing dateNov 14, 2005
Grant dateJul 11, 2006
Priority date—
Expiry dateNov 14, 2025

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02C2202/20
  • WIPO fieldMedical technology
  • WIPO sectorInstruments

Abstract

A multifocal ophthalmic lens includes a lens element having anterior and posterior surfaces with a central aspherical refractive zone disposed on one of the anterior and posterior surfaces; and a diffractive bifocal zone disposed outside of the aspherical refractive zone. The central aspherical refractive zone may be disposed on the anterior surface and the diffractive bifocal zone may be disposed on the posterior surface.

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