Process for bevelling an ohthalmic lens including a plotting stage without contact

Process for bevelling at least one edge (5, 6) of an optical face (2, 3) of an ophthalmic lens (1), which includes a plotting stage in which the successive curvatures (α) of the optical face (2, 3) are plotted in the vicinity of and along the edge (5, 6) to be bevelled, characterized in that, in the plotting stage, the edge (5, 6) to be bevelled is scanned using an optical measurement device providing a flat light beam (23) forming a linear light spot (24) on the optical face (2, 3), an image (29) of the light spot (24) is simultaneously formed on optical reception means (26), the successive curvatures (α) of the optical face (2, 3) are deduced by means for calculating the curvature of said face in the vicinity of the edge (5, 6) from the successive positions of this image (29), and in that it includes a bevelling stage in which the lens (1), mounted on a rotary support to be rotated about an axis (A1), is brought into contact by its edge (5, 6) with a bevelling tool (9) by means for moving the rotary support, and the relative positioning of the lens (1) and of the tool (9) is controlled by a control unit according to the plots produced.