My friend said it was because I seldom used sun protection. Is sun protection really important? Do I need to wear sunscreen every day? What brand will be better?

Hello, sun protection is really important! Otherwise, it is easy to get old. Let's listen to the dog.

The core of sun protection is to prevent the harm of solar ultraviolet rays to human body.

According to the biological functions of ultraviolet rays with different wavelengths, they can be divided into UVA, UVB and UVC.

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The penetration ability of the third UVC is the weakest. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer.

The second child's UVB wavelength is 290~320nm (nanometer), and its penetration is the second. Long-term contact will make people's skin become red, swollen and even peeling.

If you have ever been sunburned, congratulations on finding the culprit!

Eldest brother UVA is ultraviolet with the wavelength of 400-320nm, which has the strongest penetrating power to clothes and human skin and can reach the depths of dermis.

It can also act on melanin in the epidermis, thus causing pigmentation of the skin, blackening the skin and aging our skin.

Sun protection is UVA and UVB.

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If you think it's not enough to convince you, let's look at a real case.

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The left and right sides of this face seem to have spanned decades. It's all sunshine

The old man is a milkman in America. He has been driving a truck to deliver milk every day for 30 years, with his left face leaning against the window. Almost only this half of his face is exposed to the sun.

1. Pay attention to the travel time.

① From morning 10 to 4 pm, avoid traveling.

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② Look at the UV index before going out.

Every time we look at the weather forecast, we only look at information such as temperature, whether it is raining or not, and pay little attention to the ultraviolet index.

Actually, this information is very important. It can help us arrange our time reasonably and take preventive measures.

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Note: SPF and PA will be discussed later.

At present, the national ultraviolet forecast is divided into five grades according to the ultraviolet index.

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There are many sun protection methods in the table. In fact, sun protection is mainly divided into hard sun protection and soft sun protection.

To put it bluntly, hard sunscreen is the place where the sun shines, and soft sunscreen is mainly to apply sunscreen to protect the skin. Let's talk about it below.

2. Suggestions on sun protection

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Tip: UPF value is the ultraviolet protection coefficient specified specifically for the sun protection index of clothes.

According to the evaluation of anti-ultraviolet performance of textiles, only textiles with UPF > 40 and UVA transmittance < 5% can be called "anti-ultraviolet products".

UPF40 indicates that the transmitted ultraviolet intensity is 1/40, and the transmittance of UVA is less than 5%.

If there is no UPF value on the label, it means that this dress has no ultraviolet protection function at all.

The higher the UPF value, the better the protective effect of ultraviolet rays.

I'm sorry to tell you that those beautiful, light-colored lace umbrellas are not sunscreen. The darker the color, the better! Did it save you money again?

It can filter out most harmful light.

I bought a polarizer in a treasure, and I have worn it for a long time. How about dizziness?

Maybe this pair of glasses doesn't suit you. Please go to a regular optical shop and configure a pair of glasses specially made for you.

3. Soft sunscreen: How to choose and use sunscreen?

① Understand the SPF and PA signs.

When we go to buy sunscreen, we usually see such publicity.

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What the hell does that mean?

SPF is mainly aimed at the ultraviolet rays in the second child TVB. Oh, no, it's UVB The following figures refer to the time that can be extended.

The calculation method is: assuming that the intensity of ultraviolet rays will not change with time, a person without any sun protection measures will turn red if he stays in the sun for 20 minutes;

When he uses SPF26 sunscreen in the picture, it means that it can be extended 26 times, that is, it takes 520 minutes for his skin to turn red.

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PA (UVA protection) refers to the index of effective UVA protection. The more+,the better the anti-UVA effect.

PA+ means that tanning time can be delayed by 2-4 times, PA++ means that tanning time can be delayed by 4-8 times, and PA+++ means that tanning time can be delayed by more than 8 times.

For example, if a person stays in the sun for 20 minutes, his skin will be tanned. With the sunscreen of PA++ shown above, he can stay in the sun for 80- 160 minutes before getting a tan.

All in all,

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Stop. The larger the coefficient, the better, because the skin burden will increase accordingly.

Products with high coefficient often contain a lot of physical or chemical sunscreen ingredients, which are more irritating to the skin, easy to block pores, and even breed acne and acne.

How to correctly select the coefficient, please see the table below:

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Choose the right sunscreen and pay attention to how to use it.

② Use sunscreen 20-30 minutes before going out.

Because sunscreen takes some time to absorb and work, it must be used 20-30 minutes before going out.

If you go out for a long time, sunscreen needs to be reapplied every 2-3 hours.

The correct wiping method is to pat from top to bottom by hand.

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Be careful not to rub it, it will easily clog pores.

③ Apply enough sunscreen and 1 1 coin to your face.

Many girls wear sunscreen with the wrong idea of 1: they think that just a little sunscreen and a thin layer is enough.

In fact, this is not right, and it should be used at a dose of 2 mg/cm ㎡.

For example, facial skin needs the size of a dollar coin to achieve better results.

Note that this refers not to the thickness of application, but to the amount of sunscreen.

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④ Morphological classification of sunscreen: cream type, emulsion type and spray type.

Which is suitable for you can refer to the picture below.

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Here, I also want to remind you that the scalp will also be damaged by ultraviolet rays, so when you are outdoors, you can spray sunscreen spray on your hair or wear a hat.

I have children at home. What kind of sunscreen should I buy?

⑤ Sunscreen can be divided into physical mechanism and chemical mechanism, and children should choose physical mechanism.

The difference between physics and chemistry lies in:

Physics: blocking ultraviolet rays.

The main components of physical sunscreen cream are titanium dioxide and zinc oxide, which mainly rely on reflection or scattering to block ultraviolet rays and achieve the purpose of sunscreen.

Chemistry: Absorb harmful ultraviolet rays.

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Therefore, parents should be specially reminded that it is best to choose physical sun protection for their children.

Because the child's skin is developing, it is safer to use this kind. SPF 15 is enough.

4. Sun protection dietary advice

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Also tell you a little secret, cooked tomatoes are more delicious than raw ones. Because lycopene is fat soluble, it can be released better after cooking.

1. Replenish water

This is not to hydrate the skin, but to hydrate the body. Drinking more water is not empty talk;

cold compress

Wet the towel, cool it in the refrigerator, and then apply it to your face, or put ice water into a spray bottle and spray it on your face;

3. medicine

Compound menthol ointment, aloe gel and scald ointment have good effects and are worth a try.

Finally, I want to remind you of two points:

Don't stay in the summer sun for too long, even if you take sun protection measures.

Even on cloudy days, the intensity of ultraviolet rays will only drop by about 30%, so sun protection is something to be done all year round.