Method and apparatus for checking the centering of spectacles worn by a spectacle wearer

US9022565B2 · kind B2 · utility

Assignee

• Carl Zeiss Vision GmbH · DE

Inventors

• Ralf Sauer · Overpelt, BE
• Matthias Kubitza · Aalen, DE
• Jesús Miguel Cabeza Guillén · Aalen, DE

Key dates

• Filing date: Feb 7, 2011
• Grant date: May 5, 2015
• Expiry date: Mar 7, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B3/111
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method and an apparatus serve for checking the centering of spectacles worn by a spectacle wearer. The method comprises the steps of: a) measuring spectacle lenses mounted in a frame of the spectacles, wherein a position of permanent markings on the spectacle lenses is acquired relative to a coordinate system defined by the frame by means of an image recognition system; b) determining positions of nominal centering points, prescribed in a file, of the spectacle lenses in dependence on data of the spectacle lenses containing the position of the permanent markings; c) measuring physiological data of a spectacle wearer wearing the spectacles and determining positions of actual centering points of the spectacle lenses from the physiological data by means of a video centering instrument; d) determining the difference between the positions of the nominal centering points and the actual centering points; and e) comparing the difference to a prescribed difference threshold.