Process for bevelling at least one edge (6) of an optical face (3) of an ophthalmic lens (1), which includes a plotting stage in which the successive curvatures of the optical face (3) are plotted in the vicinity of and along the edge (6) to be bevelled. In the plotting stage, the edge (6) to be bevelled is scanned by means of a flat light beam (23) forming a linear light spot (24) on the optical face (3), an image of the light spot (24) is simultaneously formed on optical reception means (26), the successive curvatures of the optical face (3) in the vicinity of the edge (6) are deduced from the successive positions of this image. This process includes a bevelling stage in which the lens (1), rotated about an axis (A1), is brought into contact by its edge (6) with a bevelling tool, and the relative positioning of the lens (1) and of the tool is controlled according to the plots produced.