Being out in the sun can be a lot of fun for some people. Boating, tennis, golf, and the beach are just a few examples. Dr. Weil recommends that everyone use sunglasses with quality UV blocking technology in the lenses. This is whether you need a prescription or not. The linked article explains how the Ultra Violet rays from the sun can actually damage many parts of the eyes, sometimes permanently.The sun can cause UV Ray damage to the eyes