The invention relates to a method for compensating positioning error in an edging process or in a fastening operation for a raw-edged, finished spectacle lens, the method comprising: determining centring deviation parameters, said centring deviation parameters indicating the occurrence of positioning errors for the raw-edged, finished spectacle lens during a fastening operation and/or during a subsequent edging process, andmodifying control information with the aid of the determined centring deviation parameters such that the positioning errors for the raw-edged, finished spectacle lens are compensated and/or taken into account. The invention also related to a corresponding device.

An eyeglass lens processing apparatus configured to form, on a peripheral edge of a lens, a bevel or a groove for fitting the lens to a frame of an eyeglass, includes: a data calculating unit for calculating data of the bevel or the groove to be formed on the peripheral edge of the lens based on frame shape data of the frame or demonstration lens shape data which is shape data of a demonstration lens having the bevel or the groove fitted to the shape of the frame; and a correction unit for approximating a front-side foot width, which is a width between a position of the bevel or the groove to be formed on the lens and a position of a front edge of the lens, to a target value by correcting the data of the bevel or the groove calculated by the data calculating unit.

A method of preparing an ophthalmic lens (30) to be fitted into a surround of a spectacle frame, includes: acquiring a longitudinal profile (50) of the surround; centering the longitudinal profile; acquiring the geometry of at least one part of an optical face of the ophthalmic lens; calculating a treatment setpoint for treating the ophthalmic lens; and treating the ophthalmic lens. The acquiring operation includes a step of calculating the bidimensional coordinates of a plurality of measurement points (Pi, Pi) situated along two distinct longitudinal strands (51, 52) which are chosen in such a way that they define between them a band which extends along the longitudinal profile, and a step of examining the ophthalmic lens to acquire the tridimensional coordinates for the measurement points with a view to calculating the treatment setpoint.

The disclosure relates to a method for manufacturing by machining an ophthalmic device, comprising providing an optical function of the ophthalmic device to be obtained, selecting (100) an initial ophthalmic surface of the ophthalmic device intended to be manufactured, selecting (110) a manufacturing method intended to be implemented for machining the ophthalmic device and which introduces a reproducible defect, providing (120) a defect value which is function of the initial ophthalmic surface and reproducible defect and which would be introduced if the initial ophthalmic surface were produced by said manufacturing method, transforming (130) said initial ophthalmic surface into a transformed ophthalmic surface by compensating said defect, machining (150) by said manufacturing method the transformed ophthalmic surface in order to obtain an ophthalmic surface of the ophthalmic device having the optical function, wherein said manufacturing method comprises blocking (140) the ophthalmic device to be machined and the reproducible defect is a deformation defect which is due to the blocking the ophthalmic device when a face of which is machined for obtaining the ophthalmic surface of the ophthalmic device having the optical function.

The disclosure provides a method for manufacturing an ophthalmic device, comprising machining to provide a predetermined surface on a part and which corresponds to an initial ophthalmic surface, the machining comprising: selecting (130) a machining tool having a cutting edge; selecting (140) the initial ophthalmic surface of the ophthalmic device intended to be manufactured; providing (150) a determined kinematics of the machining tool which is function of the initial ophthalmic surface and of a wear parameter of the cutting edge; machining (160) the predetermined surface according to the determined kinematics of the machining tool; wherein the wear parameter is function of at least a distance travelled by the cutting edge for machining the predetermined surface and/or a friction time between the cutting edge and the part which is machined.