Introduction
Every day, our skin is confronted with environmental aggressions. Among these factors, UV radiation, which includes UVA, UVB, UVC, stands out by degrading skin texture, wrinkles, hyperpigmentation , and even increasing the risk of skin cancer .
Do you know the differences between UVA, UVB, and UVC? What is their relevance and what are their impacts on the skin? How should we approach them on a daily basis to better protect our skin? Deciphering the nuances between UVA, UVB, and UVC rays, and their impact on skin health.
The three types of UV radiation
Invisible electromagnetic spectrum:
UV radiation, invisible to the naked eye, requires in-depth understanding. Visible sunlight and invisible UV rays differ, with the latter penetrating even through clouds . Measuring energy is by wavelength in nanometers, where longer length means lower energy.
UVA: the rays of aging
Depth and long-term impact:
UVA, 320 to 400 nm, penetrates deep into the skin, even through clouds and windows. Responsible for long-term skin aging (causing pigment spots, wrinkles, sagging skin), they create toxic reactive species that alter lipids, proteins and DNA. With daily exposure to UVB 100 times greater , interior protection remains essential.
UVB: burning rays
Immediate and long-term damage:
With a higher frequency (290-320 nm), UVB causes immediately visible sun damage, such as sunburn ( solar erythema). Their closer link to DNA damage makes them the leading cause of skin cancers . Better UVA UVB protection is crucial to prevent these consequences.
UVC: rays blocked by ozone
Energetic but blocked:
Although UVC is the most energetic (200-290 nm), most is blocked by the ozone layer, limiting its impact on the skin.
HEV: High Visible Energy or Blue Light
Visible blue light: an invisible enemy for the skin
“Blue violet” light , emitted by the sun and digital screens, is a threat to skin health. With a wavelength of 400 to 500 nm, it accelerates cellular aging, causing wrinkles and spots. About 25% of cellular damage is attributed to this light. It can penetrate even deeper than UVA and synergistically into the skin layers, worsening aging.
Conclusion: protect your skin daily
Sun protection tips:
To prevent damage, opt for a broad-spectrum sunscreen that protects against UVA, UVB, and HEV. Apply daily and be sure to use at least ¼ teaspoon for optimal protection.
Essential reminder:
Sunscreen doesn't compare to your favorite concealer. The results may not be immediately visible, but the damage, such as photoaging, hyperpigmentation, and cancer risks, is measured over the long term. Daily sun protection is crucial from an early age to preserve the health of your skin and prevent photoaging and skin cancers. Skin care is an essential component of overall health.
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