We know that the sun gives life to the earth. Without it, living organisms are likely to disappear in less than a year. And yet why does the sun that gives life take away beauty? Because it ages the skin.
Let's start from the beginning. The sun emits many rays, not all of which reach the earth. The most dangerous of them are filtered by the atmosphere. However, rays reach the earth's surface and these are ultraviolet and infrared. And while the latter provide heat, the former are invisible, but have a serious biological and physiological effect. They lead to skin damage such as sunburn, photoaging and skin cancer.
Ultraviolet rays are divided into three types according to the wavelength: UVA, UVB and UVC. UVC rays do not reach the ground, so we will not pay attention to them. UVB rays pass only through the upper layer of the skin and form the so-called tan or sunburn of the skin. It is in its own way a skin reaction that activates the production of melanin and darkens.
However, UVA rays reach the deeper layer of the skin - the dermis and their impact on this inner layer leads to the so-called. "Photoaging".
And we are constantly exposed to solar radiation. Whether we are outside, in our car, at home by the window, we are exposed to ultraviolet rays.
They are present all year round, in all seasons and pass through the clouds and windows. Do not think that in cloudy weather we are protected from the sun. In fact, clouds transmit much more UV rays, and snow reflects approximately 80% of them. That is why the sun in winter is just as dangerous as in summer.
And while the body is usually protected from solar radiation by clothing, the face, neck and arms are constantly exposed to it. That's why age shows up there first. According to experts, 80% of facial aging is caused by sun exposure. Aging associated with sun exposure is called "photoaging". It is manifested by wrinkles, pigment spots and dilation of small subcutaneous blood vessels. The reason for this is that UVA rays destroy the structural protein "collagen" in the skin, which leads to:
1. Formation of free radicals and destruction of the structure of the main supporting elements of the dermis - collagen and elastin. Reducing the elasticity of collagen and elastin fibers leads to sagging skin and the appearance of wrinkles.
2. Damage to the walls of small blood vessels, which makes them more fragile and they begin to burst. This is how redness and visible capillaries appear.
3. The other most typical sign of sun damage to the skin is pigmentation. Tanning of the skin due to sun exposure is nothing but a reaction of our skin against harmful rays. Over time, this reaction leads to constant local production of melanin and the appearance of pigmentation spots.
That is why it is necessary to protect the skin from the harmful ultraviolet rays of the sun. This care should be nurtured from an early age and become an integral part of daily skin care. So just as we brush our teeth and apply face cream every day, we also need to apply sunscreen to keep our skin youthful for as long as possible.