Tanning is a natural defense method of the skin against the sun’s rays. In general, tanned skin will stop UV rays much better than white skin.
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The ultraviolet rays B (UVB) are the main causes of solar erythema (sunburn), although they constitute only 2% of the rays ultraviolet reaching the Earth’s surface. They are more energetic than UVA, which constitutes the remaining 98%. Sun creams therefore serve as a protective screen, especially against UVB rays, which are largely responsible for skin cancerbut also for UVA, because long-term exposure is also dangerous.
Sunburn: glasses that are not totally protective
The glasses absorb UVB rays, especially as they are thick and contain certain metal oxides. However, they do not block UVA rays. Stand behind a windowin car for example, therefore generally offers protection, but it is not perfect. It remains possible to sunbathe a little, even to catch a shot Sun benign following prolonged exposure.
So the next time the sun makes an appearance and you’re sitting in your veranda or near a window, do not be afraid to tan through the glass as well as sunburn. But it is strongly recommended to use sunscreen when you are in the sun.
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