Spectacle lens having astigmatic power

US4613217A · kind A · utility

Assignee

• Carl-Zeiss-Stiftung, Heidenheim/Brenz · DE

Inventors

• Gerhard Fuerter · Ellwangen, DE
• Hans Lahres · Aalen, DE

Key dates

• Filing date: Jan 25, 1984
• Grant date: Sep 23, 1986
• Expiry date: Jan 25, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/02
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention contemplates an astigmatic-power lens having at least one lens surface which differs from spherical or toric shape and which is characterized by the fact that, for each elemental region of said lens surface, the principal curvatures and the principal curvature-directions are so selected that the astigmatism of the spectacle lens and of the eye to be corrected are optimally adapted as to direction and extent.