As shown in FIG. 2, workpiece 100 has a dome shape and can be of an elastomeric material such as a silicone elastomer wherein fiber washer 120 forming haptic 118 rigidifies the dome shaped molding and enable one to easily center the lens between the laser optics systems 780 and 790 by inserting it in a holder 630 which is adapted to receive the workpiece 100 as shown in FIGS. 6 and 7.