Ophthalmic lens having a progressive effect

US5992998A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Herbert Pfeiffer · Munich, DE
• Helmut Altheimer · Munich, DE
• Walter Haimerl · Munich, DE

Key dates

• Filing date: Jun 5, 1995
• Grant date: Nov 30, 1999
• Expiry date: Jun 5, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/068
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Disclosed is an ophthalmic lens having a progressive optic power, this lens being provided with at least one surface having a surface power which changes in such a manner that, starting from at least one region, in which the optic power of the ophthalmic lens is practically constant, the optic power of the ophthalmic lens changes along at least one line (hereinafter referred to as the main line) which may lie in a plane or be sinuous and on which there is a prescribed astigmatism which is not identical with zero diopter. The surface astigmatism on the main line not only being a specific amount but also having a usually not constant axial position along the main line in such a manner that the resulting overall astigmatism of the bundle, allowing for oblique astigmatism, being practically constant along the main line after the surface of the lens facing the eye or being variable with regard to both said amount and said axial position according to physiological requirements.