Progressive spectacle lens with low magnifying differences

US6848788B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Andrea Welk · Munich, DE
• Peter Baumbach · Hersbruck, DE
• Walter Haimerl · Munich, DE
• Herbert Pfeiffer · Munich, DE
• Gregor Esser · Munich, DE
• Helmut Altheimer · Munich, DE
• Rainer Dorsch · Reutlingen, DE

Key dates

• Filing date: Oct 25, 2002
• Grant date: Feb 1, 2005
• Expiry date: Oct 25, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/08
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A spectacle lens comprises a region (distance portion) designed for viewing at large distances and in particular “to infinity”; a region (near portion) designed for viewing at short distances and in particular “reading distances”; and a progressive zone disposed between the distance portion and the near portion, in which the power of the spectacle lens increases from a value at a distance reference point located in the distance portion to a value at the near reference point located in the near portion along a curve (principal line) veering towards the nose. The invention is distinguished by a combination of the following features: a change of magnification with a direction of sight is small; the magnification increases radially, starting from the distance reference point; the difference between the magnifications at the distance and near reference points is small.