Monofocal ophthalmic lens having two aspherical surfaces

US6231182A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Gunther Guilino · Munich, DE
• Herbert Pfeiffer · Munich, DE
• Walter Haimerl · Munich, DE
• Helmut Altheimer · Munich, DE
• Gregor Esser · Munich, DE

Key dates

• Filing date: Dec 22, 1999
• Grant date: May 15, 2001
• Expiry date: Dec 22, 2019

Classification

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

Abstract

A monofocal ophthalmic lens having a front and a rear surface, each of which is aspherical, of which at least one surface has identical radii of principle curvature in the apex. The average surface refracting power of at least one of the front and rear surfaces is defined by the formula: EQU B.sub.f =(n-1)/2*(1/R.sub.1 +1/R.sub.2) wherein PA1 n: is the refractive index of the lens medium, PA1 R.sub.1 : is the radius of principle curvature 2 in a point of at least one of the front and rear surfaces in a first principle plane, and PA1 R.sub.2 : is the radius of principle curvature 2 in the point of the at least one in the front and rear surfaces in a second principle plane, and PA1 wherein the average surface refracting power of points on the at least one of the front and rear surfaces is the function of the distance h at constant azimuthal angle of .OMEGA. of each point from the apex, and the function includes an extreme value and/or a value 0.