The simplest form of protection is clothing that can effectively block UV rays. Thin, loosely woven materials offer little protection because they allow UV to penetrate to the skin. The tighter the weave, the better the protection. The thickness of the clothing is more importont than color. When sun exposure is unavoidable, wear a hat, a long sleeve shirt and long pants.
Umbrellas can also provide protection from harmful sun exposure.
Whenever a new drug is prescribed ask your physician if it may cause photosensitivity. Although testing is rarely suggested, patients can be phototested to show how sensitive they may be to UVA and UVB light. They contain chemicals such as zinc oxide, titanium dioxide, and red veterinary petrolatum that block both UVA and UVB light. The most widely used UVA blocker is Oxybenzone. Sold as a white or a colored cream, sunblocks are particularly good for skiing and hiking at high altitudes.