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Spring is not sunscreen, you really age faster than others

author:What a scientific life

Spring has arrived and the weather is starting to warm up. The spring sun is warm, and it's easy to overlook sun protection. In fact, the spring sun seems gentle, but it actually tans you in the dark and burns your skin.

Spring is not sunscreen, you really age faster than others

The sun's ultraviolet rays are the main killers of our facial skin. About 80% of facial skin aging is due to photoaging caused by exposure to sunlight. Damaged skin loses its elasticity, becomes rough and dry, and develops irregular pigmentation and deep wrinkles. Once there is obvious damage, it is difficult to recover.

Depending on the wavelength, UV rays can be divided into three types: UVA, UVB, and UVC. UVA has a wavelength of 320-400 nanometers, also known as longwave ultraviolet. It is very penetrating and can penetrate the skin tissue and mucous membrane layer, causing symptoms such as erythema, edema, pain and other symptoms on the skin.

Spring is not sunscreen, you really age faster than others

UVA is the most penetrating, can penetrate clouds, can penetrate glass. At the same time, it can also act directly on the dermis of the skin, causing us to lose collagen, making elastic fibers strike, and promoting melanocytes to produce more melanin. Therefore, UVA is the biggest killer of our skin, it can make us dark, old, and make us grow spots.

The wavelength of UVB is 280-320 nanometers, also known as medium-wave ultraviolet B, which is a kind of ultraviolet light between UV and UVA, which can be absorbed by the human body and has the functions of sterilization and disinfection, anti-aging, and promoting metabolism.

UVB has a slight ability to penetrate and will be absorbed by the atmosphere, only a small fraction of which will reach the surface. Even if it falls on the ground, it cannot penetrate glass, umbrellas and clothing. However, the harm of UVB cannot be underestimated, because UVB can make you reddened all year round and increase your risk of skin cancer.

Spring is not sunscreen, you really age faster than others

UVC has a wavelength between 100 nanometers and 280 nanometers, it is a short-wave ultraviolet light, also known as short-wave ultraviolet B (UVB), it has a shorter wavelength and can pass through skin tissue, but not through the eye. It can effectively damage the cell membranes of an organism, causing it to be damaged, leading to cell death. In addition, it affects the activity of microorganisms, which can lead to the occurrence of infectious diseases. UVC is one of the shortest waves, and normally, UVC is absorbed by the atmosphere and cannot reach the surface, causing any damage to our skin.

Sun protection is an important protective measure, mainly to prevent UVA and UVB damage to the skin. Both umbrellas and sunscreen are essential sunscreen products that can effectively prevent UV damage. Umbrellas can effectively block the sun, so that the sunlight cannot directly hit the skin, so as to achieve the effect of sun protection. Sunscreen, on the other hand, can effectively protect the skin from ultraviolet rays and avoid tanning.

Spring is not sunscreen, you really age faster than others

The PA value marked on the sunscreen product refers to the UVA defense value, PA is the abbreviation of "Protection Grade of UVA", which means "long-wave UV protection level". The higher the number of PA, the stronger its UVA resistance.

Because the most direct effect of UVA is to make people's skin dark, so the value of PA can also be called "tanning value", according to the standards of China and Japan, now are four +, so PA++++ is what we can buy now, the level of UVA protection is better, can resist the vast majority of UVA.

Spring is not sunscreen, you really age faster than others

When purchasing, pay attention to sunscreen and some special sunscreen umbrellas will mark the PA value, ignore the entire value, your sun protection may only be white protection.

The anti-UVB is based on the sun protection factor (SPF), and the SPF value is calculated based on the tolerance of sunscreen and non-sunscreen skin several times more tolerant to ultraviolet rays, and several times more sun protection time.

Suppose that in the absence of sun protection, when people are exposed to ultraviolet rays, 30 minutes of sun exposure can cause skin damage. The use of SPF15 sunscreen, under the same conditions, it takes 30 to 15 times, that is, 450✖️minutes, before the skin will appear sunburn. Therefore, the higher the SPF level, the more effective it can protect the skin from UV rays and prevent skin aging and sagging.

Spring is not sunscreen, you really age faster than others

There is a significant difference in the degree of sun protection on the left and right faces.

So, in fact, you should determine the SPF value according to your exposure to the sun, and do not set the SPF too high. If the SPF value is too large, it will bring a great burden to the skin, so blindly pursuing the SPF value is not conducive to the skin. For a normal sun, SPF15 will do, and in sunny places, SPF30 will do. If you're visiting the seaside or highlands, you might consider SPF50.

Of course, no matter how good the sunscreen is, it should also be used in moderation, and it should be replenished in time after going out. Because in the process of exercise and sweating, sunscreen will be lost, and it will not play the best sunscreen. However, after applying sunscreen, it is necessary to remove the makeup in time, otherwise it will stay on the skin overnight, and it will also cause damage to the skin.

Spring is not sunscreen, you really age faster than others

In short, no matter what time, we must do a good job of sun protection. Don't look at the fact that it's sunny, the sun isn't very strong, but don't think you don't need sun protection either. In fact, in the meteorological software we often use, there is usually one day's solar radiation data, and when the solar radiation data exceeds 3, you need to pay attention to sun protection. Even in cloudy weather, we can feel much stronger ultraviolet rays than we expected. So, before you leave, you can check the solar radiation index of your location before going to the sun protection work.

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