Patent · US Expired

Ophthalmic lens having an astigmatic effect

US5920372A · kind A · utility

5Cited by

3References

8Claims

0Family size

Assignee

Optische Werke G. Rodenstock · DE

Inventors

Gunther Guilino · Munich, DE
Herbert Pfeiffer · Munich, DE
Helmut Altheimer · Munich, DE
Rudolf Barth · Hohenkirchen, DE

Key dates

Filing date	Mar 20, 1997
Grant date	Jul 6, 1999
Priority date	—
Expiry date	Mar 20, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/061
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An ophthalmic lens in which one surface is provided with at least one region, in which the refracting power is practically constant except for aspherical corrections, and at least one transition region which is adjacent to the region having practically constant surface refracting power, and in which the surface refracting power increases or decreases continuously, and the other surface is provided with an astigmatic effect. The orientation of the surface having an astigmatic effect relative to the surface having continuous refracting power change is dependent on the position of the axis of the astigmatism of the eye. The surface having an astigmatic effect deviates from the toric shape and is independent of the orientation of the surface relative to the surface having continuous refracting power change which is a surface optimized for the axial position of 0.degree..

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.