... marks, no inside bubble and dirts5. Function: Guide of the light beams e.g. Fresnel lens, Plano lens, Bi convex ... , flat lens, round lens, Optical lens, Glass lens,Pattern lens,automobile lens6. Application: Lighting system, Electronics, Electrical apparatus, Industries, e. ... , Refractor, Molded lens, Spot lens, Lamp cover, Lamp shade, Light shade, Light cover, glass cover, glass shade, glass sheet.