Transition lenses are photo chromatic, meaning they adjust to different levels of ultraviolet in order to be clear indoors but dark outside when it’s bright. Transition lens provide glare reduction and UV protection in any light and are an excellent choice for everyday use. Transition lens provide a far superior visual experience by being more reactive to varying outdoor light conditions. Transition lens are more responsive to outdoor light, meaning they get darker when you are facing away from the sun, in reflected light and at different times of the day. Transition lens also block 100% of UV rays. When you go inside they quickly become fully clear like a regular lens.