Method of automatically preparing an ophthalmic lens for mounting, includes the following steps: automatically measuring centering characteristics of the lens; blocking the lens on cutting-out elements; feeling the lens; and cutting out the lens, wherein the lenses are treated together in pairs of lenses belonging to the same jobs, with the following consecutive steps being performed: measuring and feeling both lenses of the job; then reconciling the detected centering characteristics and the feeler information for both lenses of the job taken together, so that as a function of the result of this reconciliation, the job is confirmed or refused, and then if the job is confirmed, cutting both lenses of the job to shape, or if the job is refused, stopping the preparation of the lenses of the job.