The increasing destruction of the natural environment by humans has made people gradually fear the sun. The research that humans have done to prevent sun rays from damaging the skin has also become an eternal topic. Let us first understand the relevant knowledge of ultraviolet rays.
Ultraviolet rays are invisible rays located in the high-energy area of ​​sunlight. According to the different wavelengths of ultraviolet rays, ultraviolet rays can be divided into three regions. That is short-wave ultraviolet, medium-wave ultraviolet and long-wave ultraviolet.
Shortwave ultraviolet: referred to as UVC. It is ultraviolet light with a wavelength of 200-280nm. Shortwave ultraviolet light is absorbed by the ozone layer as it passes through the stratosphere on the earth's surface. It cannot reach the surface of the earth and has an important effect on the human body. Therefore, enough attention should be paid to short-wave ultraviolet. Medium wave ultraviolet: referred to as UVB. It is ultraviolet light with a wavelength of 280-320nm. UVB has a certain physiological effect on human skin. A large part of these ultraviolet rays are absorbed by the skin epidermis and can no longer penetrate into the skin. However, due to its high level energy, it can produce strong light damage to the skin, the dermal blood vessels in the irradiated part expand, and the skin can appear redness, blisters and other symptoms. Long-term exposure to the skin can cause erythema, inflammation, and skin aging. In severe cases, it can cause skin cancer. Medium-wave ultraviolet rays, also known as the sunburn (red) band of ultraviolet rays, are ultraviolet bands that should be focused on prevention.
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