The invention relates to a method of centering a single vision non-edged ophthalmic lens (1) possessing an initial outline (2) associated with a centering point (CO) and that is to be shaped (edged) to take up a final outline (3) associated with a pupil point, the method comprising the steps of: superposing the pupil point of the final outline on the centering point of the non-edged lens; and adjusting the relative position of the final outline to fit within the initial outline of the non-edged lens. The step of adjusting the position of the final outline to fit within the initial outline includes angularly orientating the initial outline relative to the final outline about the centering point in compliance with an adjustment angular position to avoid or reduce any protrusion of the final outline beyond the initial outline of the lens.