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The importance of sunscreen to prevent photo-aging due to ultraviolet rays

Overview

Most of us have heard a lot in our lives that ultraviolet rays are dangerous and sunscreen is important. However, surprisingly, many people do not apply sunscreen well even though they know this. 
"I like dark, well-tanned skin, so I don't have to put it on. "
"I don't usually go outside, so it's okay. "
If you've ever thought like this, you have no idea how crucial ultraviolet rays are. Ultraviolet rays are the main culprit of skin aging and must be prevented when your skin is still young. 

Starting with this article, I will make a sunscreen section on the blog and continue to write content related to sunscreen. I hope that many people recognize the importance of sunscreen and help block ultraviolet rays in the correct way.

Effects of UV rays on our skin


It would be faster to understand visually than to express it in words, so I brought a famous picture. Looking at the skin of the elderly, it can be seen that the aging of the left skin has progressed rapidly compared to the right.

The old man was late 60 years old when he took the picture, and he drove a truck for nearly 30 years. Since the driver's seat is on the left side, more ultraviolet light was exposed to the left skin than to the right. As such, ultraviolet rays are one of the biggest elements of wrinkles.

Second, ultraviolet rays can cause pigmentation. In the first old man's picture, it is difficult to see due to deep wrinkles, but the pigmentation is very serious. Pigment deposition can vary from person to person, such as spots and soot. As shown in the picture below, it may appear throughout the skin or partially.


The aging phenomenon, including wrinkles and pigmentation caused by ultraviolet rays, is called dermatoheliosis or photoaging.

What are UV rays?

Ultraviolet rays are divided into UV-A, UV-B, and UV-C according to the length of each wavelength. Here, UV stands for Ultraviolet rays.

UV-A has a wavelength of 320 nm to 400 nm, which digs down to the dermis of our skin. As a result, it destroys collagen and elastin, reduces tension, and thick and strong wrinkles begin to settle upon prolonged exposure. 

Of course, before reaching the dermis, even melanocytes in the epidermal layer are affected to promote melanin production, which causes pigmentation.

UV-B has a wavelength of 290 nm to 320 nm and may penetrate into the base layer of the epidermis. This also affects melanocytes, causing pigmentation.

UV-C has a wavelength of 200 nm to 290 nm, which is filtered before reaching the Earth's surface.

Should Sunscreen be applied indoors?

UV-B cannot pass through the window because of its short wavelength. 

Many people enjoy the sun shining through the window to make vitamin D, but UV-A can only penetrate the window. However, photosynthesis through windows is virtually meaningless since only UV-B can make vitamin D.

The key point is that UV-A passes through the window and causes the aging of our skin. In the U.S., tinting is not allowed on vehicles, but tinting is legal in Korea. However, no matter how well made the tinting sheet is used, it does not stop UV-A 100%.

Conclusion

Depending on the SPF, sunscreen can block UV rays up to 98%. It can prevent aging as well as prevent the possibility of pigmentation. 

Many people are stingy when it comes to applying sunscreen while applying expensive skincare products for their skin. This may be because the effect of applying sunscreen is not visible whereas most expensive skincare products have instant visual effects. But this is a very wrong choice.

If skincare products improve skin, sunscreen prevents skin from regressing(aging). In a way, sunscreen may be an essential routine that is more important than skin care.

Source

Location: South Korea

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