Do you need your glasses all the time? Does it bother you to always have to carry two pairs of glasses at all times so that you can see perfectly indoors and protect your eyes against glare and UV rays outdoors when it is sunny? Eyeglasses with self-tinting lenses can make your life more comfortable, as you always have the right tint for all light conditions in one set of glasses. PhotoFusion® prescription eyeglass lenses with a high or medium refractive index darken in just 15 to 30 seconds in bright light or sunlight*. Indoors, they brighten again in 5 to 10 minutes*, becoming clear enough to see distinctly in a short time. Of course, they also offer 100 percent protection against UV rays at all tint levels.