Abstract: A spectacle lense is formed so that its critical center is on the visual axis of the eye of the patient. The point where the visual axis of the eye intersects each lense of a spectacle to accomplish this purpose, is marked on a plane simulated lense of a transparent resilient plastic material. The simulated lense is contoured so that its contour is congruent to the contour of the spectacle lense. A wand is provided for determining the point where the simulated lense is to be marked. The wand includes a transparent plate having a target mark. Magnets are secured to the plate near its periphery. The transparent plate is mounted on the outer surface of the simulated lense with the plate engaging this outer surface and held in slideable engagement by the magnets on the plate and cooperative magnets on the inner surface of the simulated lense. The wand is set to align the target mark with the center of the pupil of the eye. The simulated lense is then marked at the point coincident with the target mark.

Abstract: A method of embellishing memorial stones and the like wherein a cavity is cut or sandblasted in the stone to produce a decorative design. An epoxy resin base is inserted into the cavity and permitted to set. Decorative glass chips are arranged in a mosaic-like pattern in a resin of similar properties to the base, the mortar, and a bond is formed between the base resin, the mortar resin, and the decorative chips to provide a pattern on the memorial stone.