The Ninox adds to our rounded shapes with an almost-true circle, which is a popular shape for both men and women. Available in two sizes, so you can find your perfect fit. Purchase as regular sunglasses with tinted polycarbonate lenses or have clear lenses installed through your doctor or by us and use the magnetic fronts to provide tinting in bright environments! *Flying Eyes RX service is only available for US customers at this time. (Solid Copper, Mirrored Amethyst, Mirrored Sapphire & Mirrored Sunset are HIGH CONTRAST lenses that improve and increase contrast, without the hazards of polarization.)