Transitions
Transitions are a lens brand that use a photochromic technology to create a functional 2-in-1 lens. When your Transition lenses are exposed to UV light trillions of photochromic molecules within the lens begin to change structure. This reaction is what causes the lenses to darken to your chosen tint, serving as extra sun-light protection and then quickly fades back to clear when you come back indoors out of the UV light.