... ,cylindric 4.Polished Lens 5.Clear and optical quality Optical magnifying lens for Optics and Lighting 1. Raw material of ... : Plano convex,double convex,bi convex,cylindric4. Inside quality of magnifying lens: clear and transparent, no mold marks, no inside bubble ... and dirts,5. Function of magnifying lens: magnifying lens for magnifier for Lighting and Optical purpose