The protection conferred by the windows of a car or a window vis-à-vis ultraviolet (UV) rays is quite relative.
If they stop UVB (responsible for sunburn, therefore useful insofar as they thus give the alert of an excess of UV of all kinds), the windows allow UVA and visible light to pass.
However, UVA rays are harmful in more than one way. One, they stimulate pigmentation in the skin, making dark spots worse. Two, they play a key role in the aging of the skin, especially as they penetrate deeply, down to the dermis.
Finally, they promote skin cancer, including melanoma (such as UVB). Visible light (that which comes from the sun, not screens) also amplifies pigmented lesions.
The best products
To counter these harmful effects of the sun’s rays, use a protective cream, in sufficient quantities, the equivalent of a teaspoon for the face, the most fragile
, indicates Professor Thierry Passeron, head of the dermatology department of the CHU de Nice, director of the Inserm 1065 team at C3M in Nice (study of the mechanisms of pigmentation disorders).
A “balanced” cream that will protect both UVB and UVA rays. The legislation in Europe imposes a ratio of 1 (for UVA) to 3 (UVB), but the most effective products are endowed with a UVA / UVB ratio as close as possible to 1. These manufacturers who play the game (also anti-UVA protection) put it forward of course (Roche-Posay or Bioderma).
Finally, to minimize the deleterious effects of visible light, anti-oxidants can be added to formulas and specific tinting creams prevent hyperpigmentation.
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