The most basic is the eyeglass lens. The eyeglass lens is by far the best in absorbing ultraviolet light. It comes in several different colors and is, of course, scratch resistant. It is also one of the least expensive.
The downfall to the eyeglass lens is the weight of a pair of prescription glasses made of glass. They are also very breakable and have to undergo a heat-treated process to ensure durability. (more eyeglasses…)