New Sapphire High Hardness Anti-Blue Dual-Use Reading GlassesThese Master Craftsmen Are The First In The World To Incorporate Pc Materials Into Glasses. Their process combines the traditional art of frame making with modern technology to produce exceptional quality reading glasses. Suitable for a variety of occasions Anti blue light multifocal glasses for indoor or outdoor, all weather wear, for people with presbyopia problems, especially when reading books, newspapers, watching TV, playing games, traveling,