Method for simulating and demonstrating the optical effects of glasses on the human face

US6965385B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Andrea Welk · Munich, DE
• Helmut Altheimer · Munich, DE
• Peter Baumbach · Hersbruck, DE
• Gregor Esser · Munich, DE
• Walter Haimerl · Munich, DE

Key dates

• Filing date: Feb 13, 2002
• Grant date: Nov 15, 2005
• Expiry date: Apr 12, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G09B23/28
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method is provided for demonstrating an effect of a particular spectacle frame and of optical lenses fitted into this spectacle frame on the appearance of a spectacles wearer as it would be perceived by another person (virtual observer). An image of a face of the spectacles wearer is prepared in such manner that the image can be processes in a computer. An arrangement of the respective spectacle frame in front of the eyes is determined. The image of the face is projected onto a plane by a computation (ray-tracing) of principal rays passing through a center of rotation of an eye of the (virtual) observer to produce a planar image of the face in this plane. Taking into account an optical power of a region, through which a principal ray passes, of each spectacle lens (virtually) fitted in the respective lens rim, and it arrangement in front of the eye, the paths of prinipcal rays which lie within lens rims of the spectacle frame or edges of the spectacle lenses are computed so that an observer of the thus-produced planar image of the face with “worn” spectacles can assess a distortion of the eyes portion of the face by the spectacle lenses and therewith a quality of the spectacle le…