Rather than considering the amount of protection that they afford, new sunglasses are often selected for their frames, the size of the lenses, or for a particular coating on the lenses. It is important to remember, however, that the most important job for sunglasses is to prevent damage to the eyes from the sun's harmful rays. Fortunately, with a little knowledge about Ultraviolet (UV) radiation and sunglasses technology, fashion does not have to take a backseat to safety.