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

摘要

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.

主权项

1. A method for checking actual centering points of spectacles worn by a spectacle wearer, the spectacles containing lenses having a refraction effect which are mounted in a frame having frame rims, comprising the steps of:
a) measuring, by means of an image recognition system, the positions of permanent markings on the spectacle lenses relative to a coordinate system defined by the frame rims, wherein said measuring step is performed exclusively with image data of the spectacles only; b) determining relative to the position of said permanent markings, 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, by means of a video centering instrument, the position of the centers of the pupils and/or the pupil spacing of a spectacle wearer wearing the spectacles, corrected in accordance with the refraction effect of the lenses, and determining therefrom the positions of the actual centering points of the spectacle lenses relative to the coordinate system defined by the frame rims in step a); 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.