Ultraviolet ray is one of the important factors causing skin aging. And as an invisible killer, ultraviolet ray will cause different degrees of damage to the skin even if you do not deliberately hug the sun in daily life. Today let's learn about ultraviolet rays and help you choose the right sun visors hat to reduce the damage of ultraviolet rays.

Most people don’t know that there are four kinds of ultraviolet rays classified by the wavelength.

UVA

UVA refers to ultraviolet radiation A, with a wavelength of 320-400nm, which has a strong penetrating ability. It can not only penetrate the ozone layer and clouds to the earth's surface but also penetrate most of the transparent glass and plastic in everyday life which means it is not safe to stay near to the window indoor. And this is why so many people still get tan indoor and even worse it can also penetrate the skin to the dermis.

Considering the strong penetrating ability, people who don’t want to become tan had better apply sunscreen on your face and parts of your body exposed in the air. In order to ensure the protection of sun scream, you had better apply it again 3-4 hours later.

UVB

UVB refers to ultraviolet radiationB with a wavelength of 280 to 320nm, weaker ability of penetration. UVB also has a shorter wavelength than UVA, so most of it can be absorbed by transparent glass and the ozone layer. Less than 2% of UVB reaches the earth's surface. Generally, UVB is particularly intense in summer and afternoon. Exposed in a long time will cause skin tanning and aging, edema, peeling and other problems.

Considering the property of UVB, we can wear sun-proof clothing, sports sun visors 👇or walking under sunshade to avoid the direct sunlight. But there are so many people who work hard on the construction sites all the day, and they haven’t free hand to hold a umbrella. As for these people, sports sun visors is the best option as wearing an extra clothes is too hot for them in summer day but sports sun visors can protect them from the ultraviolet ray with less contact to their head.

UVC

UVC refers to ultraviolet radiation C, belonging to short-wave ultraviolet (uv) with a wavelength of 200 to 280nm. It has the weakest penetration ability, so UVC cannot penetrate transparent glass and plastic. Because UVC is almost absorbed by the ozone layer when it penetrates the ozone layer, UVC cannot penetrate the ozone layer directly to the earth's surface.

But we still can’t neglect the harm of this kind of ultraviolet ray because it can burn the skin in short time irradiation, while skin cancer would be triggered by it in a long time exposure or high strength. By the way, it can be used to shortwave ultraviolet uv germicidal lamp. Generally speaking, we needn’t worry about this type ultraviolet ray but note that there are some space where the ozone layer has been damaged greatly which you had better not to go.

UVD

UVD refers to ultraviolet radiation D, belonging to vacuum ultraviolet light with a wavelength of 100-200nm. Ultraviolet light in this band can be absorbed by the ozone layer, so it can only travel in vacuum and cannot exist in the presence of oxygen. So, it doesn't reach to people’s skin.

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Conclusion

It can be seen that each band of ultraviolet rays will cause different degrees of damage to the skin. Skin scientists did a lot of studies for these ultraviolet rays, and among them, UVA and UVB researching have achieved the biggest development. Their direct damage to the skin is also from weak to strong, and their harmful effects are also different. The direct damage of UVB to the skin is the strongest, and the change of the four seasons is obvious. UVA is the most penetrating, with little change from season to season, but UVA rays account for 97 percent of the ultraviolet rays that reach the earth's surface. Therefore, UVA and UVB protection in daily life is very important.

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