Method and apparatus for checking the centering of spectacles worn by a spectacle wearer
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United States of America Patent
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May 5, 2015
Grant Date -
Aug 25, 2011
app pub date -
Feb 7, 2011
filing date -
Aug 13, 2008
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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.
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