Iconic designs are the hallmarks of this famous brand.       Your New "No Line" Lenses, also known as Progressive Lenses, will provide a clear, comfortable close up vision, without a line of sight.    The Upper portions of your lenses are clear. As you lower your eyes, the magnification increases gradually allowing you to see better at different close up distances.    CR39 Optical resin. 1.50 index of refraction.  Frame:  Optical grade plastic    Lenses:  Lightweight optical quality plastic Dist Glasses Black, Reading Sunglasses, Face Forward, Microfiber Cleaning Cloths, Clean Microfiber, Full Frame, Famous Brands, Reading Glasses, Round Shape