China A-Star optical lenses 1. Raw material of Optical lens: Pyrex, Optical glass. Crystal glass 2. Techniques of Optical lens: by Molding, Grinding, Polishing 3. Shape of Optical lens: Plano lens,bi convex lens,bi concave lens, ball lens,Spherial lens 4. Inside quality of Optical lens: clear and transparent, no mold marks, no inside bubble and dirts, […]