... : Pyrex, Optical glass, Crystal glass 2,Size and shape: customer's requirement 3,Lead Time: 30 days 1, Techniques of Optical lens: by ... Molding, Grinding, Polishing 2, Shape of Optical lens: Plano lens,bi convex lens ... concave lens, ball lens,Spherial lens 3, Inside quality of Optical lens: clear and transparent, no mold marks, no inside bubble ...