All RAEN models are outfitted with Optics by Carl Zeiss Vision CR-39 lenses for optimum visual comfort and complete eye protection. Carl Zeiss is the global leader when it comes to the finest camera glass, precision microscope optics and more. The CR-39 sun lenses in RAEN models have superior optical properties and material pureness. They offer excellent quality of vision, subtle tints and a very light weight. Thanks to the use of top polarizing film and manufacturing expertise, Optics by Carl Zeiss Vision CR-39 Polarized lenses deliver advanced optical features, visual performance, and outstanding polarizing efficiency while ensuring eye comfort and a relaxed vision.