Patent ID: 7219995

Claim:
An apparatus for determining the distance between the pupils for defining precisely the parameters relevant to grinding spectacle lenses for the alignment of optical lenses in a spectacle frame, as an integral component of a video centering system provided with a camera ( 2 ), a zooming device ( 3 ), a computer ( 4 ) with a monitor ( 5 ) and a calibration device ( 1 ) in which the size (OG) of the subject is presented by indicia (A; B) on the calibration device ( 1 ) disposed in the plane of the spectacle lens of the spectacle socket to be measured, the indicia (A; B) being detected by the camera ( 2 ) and transmitted to the computer ( 4 ) for determining the actual value of the shooting distance (AE) which forms the basis for the value of the position (P) of the distance between the pupils.