Many of us are careful to look for a high sun-protection factor (SPF) when we buy sunscreens, moisturizers and makeup. But here's the rub: SPF only measures protection from one type of harmful rays -- ultraviolet B (UVB) rays that cause sunburn.
Unfortunately, sunburn protection doesn't equal skin-cancer prevention. UVB was once regarded as the main culprit in skin cancer as well as in sunburn, but experts now think that light waves in the ultraviolet A (UVA) part of the spectrum also contribute greatly to skin cancer. UVA, which penetrates the skin more deeply than UVB, also contributes to skin aging.
Read article here:
http://www.orlandosentinel.com/features/health/orl-uvbblock07may08,0,3618534.story?coll=orl-health-headlines
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