Tifosi eyewear talos fototec light night sunglassesfototec lenses with variable tint technology adjust rapidly to changing light conditions for superior clarity and protection in bright sun microscopic photochromic particles embedded in the lens react to uv rays darkening the optics so youll never squint with cloud cover the particles return to their previous state letting through more light tifosis fototec lenses are market leaders because of their lightweight durability and incredib