... lens 1. Raw material: Borosilicate glass, Pyrex, Borofloat, Optical glass, Crystal glass2. Processing: by Molding, Grinding, Polishing3 ... . Surface quality: optical surface quality and well controlled tolerance4. Inside quality: clear ... lens, Prism, Cylindrical lens, Ball lens, Spherical lens, Aspheric lens, Meniscus lens, flat lens, round lens, Optical lens, ...