Double progressive spectacle lens

US7144110B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Walter Haimerl · Munich, DE
• Helmut Altheimer · Munich, DE
• Gregor Esser · Munich, DE
• Edda Wehner · Grafing, DE
• Andrea Welk · Munich, DE

Key dates

• Filing date: May 13, 2005
• Grant date: Dec 5, 2006
• Expiry date: May 13, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/061
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A double progressive spectacle lens having a prefabricated progressive surface and a second progressive surface for correcting a spherical ametropia or a cylindrical ametropia, in which the surface properties of the progressive surface in the vicinity of the principal line of sight are asymmetric, the asymmetry being determined by the symmetry factor SA, which is determined in relation to the level A by the ratio of the smaller to the larger horizontal distance between the principal line of sight and the location at which the surface astigmatism in the horizontal section reaches the value A [dpt].