However, they can be programmed with a variety of gradient index (GRIN) structures including diffractive and refractive lenses. The polymers self develop in respnse to light, enabling complex 3D GRIN ...

This sunglasses three-pack comes with three styles: Leopard Frame with Green Lenses, Black Frame with Gradient Grey Lenses, and Leopard Frame with Brown Lenses. If you lose sunglasses often ...