METHOD OF PREPARING AN OPHTHALMIC LENS

摘要

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 (P′i, P″i) 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.

主权项

1. A method for preparing an ophthalmic lens to be fitted into a rim of a spectacle frame, comprising:
an operation for determining the two-dimensional geometry of a longitudinal profile of said rim; a centering operation in which said longitudinal profile is positioned in a frame of reference related to the ophthalmic lens; an operation for acquiring the geometry of at least one portion of an optical face of the ophthalmic lens, by contact or contactless probing of said longitudinal profile on said optical face of the ophthalmic lens; an operation for determining instructions for processing of the ophthalmic lens depending on the geometry and position of the longitudinal profile in the frame of reference related to the ophthalmic lens, and depending on the geometry of said portion of said optical face of the ophthalmic lens; and an operation for processing the ophthalmic lens according to said processing instructions, wherein said acquiring operation comprises: a step of calculating, depending on the two-dimensional geometry of said longitudinal profile, two-dimensional coordinates of a plurality of measuring points located along two separate longitudinal traces that are arranged on either side of said longitudinal profile and that are chosen such that they define between each other a strip that extends along said longitudinal profile; and a step of examining said optical face of the ophthalmic lens in order to acquire the three-dimensional coordinates of said measuring points, and in that said processing instructions are determined depending on the three-dimensional coordinates of said measuring points.