The Oakley Meta HSTN Smart Glasses are available with Transitions Amethyst lenses, which are photochromic lenses that automatically adjust from clear indoors to a shaded violet/black tint outdoors. This allows them to function as both clear glasses and sunglasses, depending on the ambient light conditions. The lenses use Transitions Light Intelligent Lenses technology to seamlessly switch from a clear state in low-light or indoor conditions to a darker, amethyst tint when exposed to UV light outdoors.