Progressive power ophthalmic lens

US4946270A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Gunther Guilino · Munich, DE
• Rudolf Barth · Hohenkirchen, DE
• Hans Stetter · Munich, DE

Key dates

• Filing date: Jan 11, 1989
• Grant date: Aug 7, 1990
• Expiry date: Jan 11, 2009

Classification

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

Abstract

A progressive power ophthalmic lens having at least one surface contributing to an increase in power from a distant portion via a progressive zone to a reading portion, radii of curvature of horizontal section curves of the at least one surface contributing to an increase in power and having horizontal planes as a function of the distance from the main meridian decrease in a front surface in the region of the main meridian in the distant portion and increase in the rear surface in the distant portion and decrease in the reading portion, and the course of change of the curvature .DELTA.rh-rh(x,y)-rh (0,y) reverses with increasing distance x from the main meridian.