Opthalmic lens for use in the correction of astigmatism

US5061058A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Gunther Guilino · Munich, DE
• Herbert Pfeiffer · Munich, DE
• Helmut Altheimer · Munich, DE

Key dates

• Filing date: May 18, 1989
• Grant date: Oct 29, 1991
• Expiry date: May 18, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C2202/12
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An ophthalmic lens for use in the correction of astigmation, wherein in order to reduce the critical thickness and/or the variation of the edge thickness along the circumference of the lens, the refractive index changes at least along the critical main section in such a manner that at least part of the cylindrical correction is attained by the refractive index variation.