PROCEDIMENTO ED APPARECCHIO PER LA FABBRICAZIONE DI LENTI OFTALMICHE PER COLATA

摘要

Cast multifocal lenses are produced from ledged casting pieces molded from a master die having a molding surface made up of juxtapositioned die components each precision surfaced to a curvature and finish corresponding to a multifocal surface desired to be cast upon a lens and relatively prearranged according to desired height and position of cast lens ledging.