US 11,693,258 B2
Computer-implemented method for fitting a spectacle lens to a spectacle frame
Helmut Wietschorke, Aalen (DE)
Assigned to Carl Zeiss Vision International GmbH, Aalen (DE)
Filed by Carl Zeiss Vision International GmbH, Aalen (DE)
Filed on Feb. 21, 2022, as Appl. No. 17/676,528.
Application 17/676,528 is a continuation of application No. PCT/EP2020/074158, filed on Aug. 28, 2020.
Claims priority of application No. 19195132 (EP), filed on Sep. 3, 2019.
Prior Publication US 2022/0171213 A1, Jun. 2, 2022
Int. Cl. G02C 7/06 (2006.01); G02C 7/02 (2006.01); G02C 13/00 (2006.01)
CPC G02C 7/027 (2013.01) [G02C 7/068 (2013.01); G02C 13/005 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A computer-implemented method for fitting a spectacle lens having a first spectacle lens surface, a second spectacle lens surface, and at least one intended dioptric power to a spectacle frame having a predetermined frame edge curve, the method comprising:
fitting a free-form surface formed on the first spectacle lens surface to the frame edge curve of the spectacle frame,
wherein the free-form surface is fitted to the frame edge curve by simultaneously optimizing the free-form surface and the second spectacle lens surface with regard to minimizing a difference between the free-form surface edge curve and the frame edge curve and with regard to attaining the at least one intended dioptric power of the spectacle lens, the free-form surface and the second spectacle lens surface mutually influencing one another during the optimization,
wherein the simultaneous optimization of the free-form surface and the second spectacle lens surface is implemented iteratively, the second spectacle lens surface being altered first in each iteration step and the free-form surface then being optimized with regard to attaining the at least one intended dioptric power of the spectacle lens,
wherein in each iteration step the optimization of the free-form surface is followed by a determination of a measure for a deviation of the free-form surface edge curve present after the optimization of the free-form surface from the frame edge curve; and
terminating the method if the measure for the deviation is less than a given value or a change in the measure is less than a given value, or, otherwise, in a subsequent iteration step:
modifying the second spectacle lens surface; and
subsequently optimizing the free-form surface again with regard to attaining the at least one intended dioptric power of the spectacle lens.