Progressives brillenglas lens with additional channel of vision

US4952047A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Rudolf Barth · Hohenkirchen, DE
• Herbert Pfeiffer · Munich, DE

Key dates

• Filing date: Jun 20, 1988
• Grant date: Aug 28, 1990
• Expiry date: Jun 20, 2008

Classification

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

Abstract

A progressive power ophthalmic lens having a convex front surface and a concave inner surface, of which at least one surface contributes to an increase in refractive power from a portion suited for distant vision via a progression zone to a portion suited for near vision along a plane or curved main meridian, along which the overall astigmatism is .ltoreq.0.5 dpt. The invented opthalmic lens is distinguished in that in order to form further channels of vision, the at least one surface contributing to increasing the refractive power is provided with at least one additional line which does not intersect the main meridian and runs from the distant portion to the bottom edge of the ophthalmic lens and on which the surface astigmatism has a minimum local value.