Sunglasses designed to reflect ultraviolet rays, will protect the delicate and thin skin around the eyes, as will broad brimmed sun hats or visors. Wear them whenever you are in the sun. Look for sunglasses labeled "100% UV protection and which have the designation "Z 80.3 Standard" on the temple piece or frame. This number means that the lenses meet or exceed the American National Standard Institute guidelines. Your ophthalmologist or optometrist can check your sunglasses for their ability to filter ultraviolet light. If your sunglasses do not filter UV light, they can be coated by an optometrist or optician to make them do so. Prescription glasses which are not sunglasses may also be UV protected, Clothing may only partially filter ultraviolet light. Darker colors are not nearly as significant as the tightness of weave. Looser weaves allow the sun to penetrate and sunscreens should be worn under them. The sun will also penetrate wet clothes, so a waterproof sunscreen should be applied. Some clothing is now marketed with an SPF designation on the label.