Doctor, what can you tell me about protecting myself from the sun?
Consumers often feel a false sense of security when purchasing sunscreen with a big shiny SPF 50 or higher slapped onto it. It’s imperative to understand that the quantity of sunscreen applied is more important than its SPF strength when achieving ultimate sun protection.
Take, for example, sunscreen with an SPF of 15. It absorbs 93 percent of UV radiation, whereas sunscreen with an SPF of 30 absorbs 97 percent. The increase in the percentage of radiation absorbed due to an increase in SPF is minimal compared to the percentage absorbed when a sufficient amount of sunscreen is applied to the skin. It is more effective to stick with SPF 30 and reapply it frequently than it is to use a sunscreen with a higher SPF.
It’s also important to remember that sunscreen works as a chemical absorber, as opposed to sunblock, which physically blocks UVB and UVA rays. Conventional sunscreens do not protect against UVA radiation, and this is critical because it damages cells deep within the skin, increasing the risk of melanoma. Sunblock products that read “broad spectrum protection” and contain titanium dioxide or zinc oxide are your best bet, especially for sensitive skin types.
Even if it’s cloudy outside, remember that you still need to put on sunscreen. A common misconception with overcast weather is that sun protection is optional or not needed. Think of cloudy weather as a decrease in visible light only, not in UV radiation. In reality when the sun doesn’t show, you can guarantee that UV rays will. In fact, 80 percent of UV radiation is still present because its specific wavelength easily penetrates through thin cloud layers. Also consider that when driving or when near a window, UV rays penetrate through glass as well.
If you plan to be outdoors apply sunscreen just as you would on a sunny day for ultimate protection.
Generally you can use whichever form of sunscreen suits your needs and is convenient for you. However, there is an advantage in using lotion due to its thickness. Since the face is the most important area to avoid UV radiation, using sunblock lotion there is particularly recommended.
For sprays you will want to apply repeatedly to the same area to get a sufficient layer of protection. The primary idea to keep in mind regarding all forms of sun protection is to always apply and disperse the proper amount to exposed areas. Only you know how much sun is hitting your skin.
On a last note, remember that the effectiveness of sunscreens and sunblocks depends on proper use by you. Applying generous amounts not only to your face and torso but also to your lips, ears, neck and feet is vital, as skin cancers and melanomas are prone to developing in those areas. If you go swimming or perspire, reapply. If you’re outdoors for more than three hours, reapply. Taking these extra precautions will ensure your time spent in the sun this summer is healthy and safe.