Patent ID: 9664924
Date: 2017-05-30
CPC Classifications: B24B,G02C

Claim:
1. A method of processing an unfinished optical lens member for manufacture of an optical lens from the unfinished optical lens member, the unfinished optical lens member being provided with a finished surface having a geometrical center reference point, the optical lens having a first and a second surface, said first surface being comprised in the finished surface of the unfinished optical lens member, the method comprising: providing contour data defining the contour of the first surface of the optical lens in a finished cut state, the maximum distance between two points of the contour being defined by a distance C determining, an optical reference point of the first surface of the optical lens with respect to the contour, said optical reference point being defined from the line of sight of a user of the optical lens in the finished cut state, the maximum distance between the optical reference point and the contour being defined by a distance Mmax, providing a first surface dataset defining the second surface with respect to the optical reference point; providing an unfinished optical lens member having a minimum distance RSF between the geometrical center reference point and the boundary of the unfinished optical lens member such that 2 RSF≧Cmax and RSF<Mmax; virtually offsetting the optical reference point of the optical lens on said first surface with respect to the geometrical center reference point of the unfinished optical lens member such that when the contour of the optical lens is offset in correspondence with the offset optical reference point, said offset contour is within the boundaries of the unfinished optical lens member; and transforming the first surface dataset into a second surface dataset defining the second surface with respect to the virtually offset optical reference point.