The updated Ray-Ban aviator sunglasses feature the Ray-Ban Evolve photochromatic lenses. The Evolve photochromatic lens treatment allows a gradual change of lens color from a lighter shade to a darker shade within three minutes when exposed to UV light outdoors. No other light will result in the color change. Within five minutes of stepping back inside, the Evolve lenses in the RB3025 will gradually change back to the original color! Made from high-quality glass, Ray-Ban lenses are prescription ready.