... 4.Polished Lens 5.Clear and optical quality Optical magnifier lens for Optics and Lighting 1. Raw material of ... Optical glass. Crystal glass2. Techniques of magnifier lens: by Molding, Grinding, Polishing3. Shape of magnifier lens: Plano convex,double convex,bi convex4 ... . Inside quality of magnifier lens: clear and transparent, no mold marks, no inside bubble ...