9 sunscreen mistakes, quickly correct it.
1. Sun protection products are only needed when the sun is strong.
The transmission of ultraviolet light follows the optical laws of visible light. Since visible sunlight can penetrate the clouds, ultraviolet light can also be used. In the case of clear and cloudless weather, the ultraviolet radiation intensity is 2000 (microwatts per square centimeter), then the cloudy weather may be 1000, the cloudy day is about 300, and the rainy day is about 100.
Below 200 can be considered safe without special protection, so protection is still needed on cloudy and cloudy days, which may not be recognized by most people, so that the sunscreen effect is greatly reduced.
2, the higher the sun protection index, the more the sun protection effect can be improved
The higher the sun protection index of sunscreen, the more sunscreen added (from quantity to concentration), and the sunscreen ability is indeed higher under standard test conditions. However, the pursuit of a high sun protection index may also make you more sun-stained - many people believe that high-index sunscreen can prevent all the damage from the sun, so you can let the sun shine after painting. But in fact, any sunscreen can only protect part of the ultraviolet rays, and can not protect the visible light and far infrared rays. Therefore, the use of high-index sunscreen does not necessarily bring complete protection. Instead, it may make you take it lightly and act excessively in the sun. Damaged by the sun.
3, just use anti-UVB (SPF) is enough
In fact, UVA's long-term damage is greater than UVB, so UVA protection must be the focus. In my opinion, the SPF value is not necessarily too high, 15 or 20 is enough, but the PA value must be "+++" to be at ease.
4, sunscreen is only enough once a day is enough
This statement is not entirely correct. Most people, if they only work indoors, go to work on the road in the morning, and then stay indoors until they get off work. You can only apply sunscreen once in the morning. However, if you are an outdoor worker, or if you are shopping for a long time and playing outside, you will need to apply it several times. Sweating and swimming need to reduce the recoating time to 40 or 80 minutes, and it must also be a waterproof sunscreen.
5, sunscreen needs to be applied once every 2 hours
Many people think that sunscreen will fail on the surface of the skin for 2 hours, so it needs to be applied once every 2 hours. In fact, as long as the sunscreen is not eluted and erased, it will always play a protective role on the skin surface. The replenishment only occurs when it is sweating, washing, and erasing (the sunscreen is destroyed). If you don't have these conditions, you don't need to apply them frequently—especially indoor workers.
6, sunscreen needs to be painted 30 minutes in advance
Under standard test conditions, sunscreen should be applied to the skin and allowed to stand in the constant temperature, constant humidity laboratory for 30 minutes before starting the test. In fact, from the moment the sunscreen is applied to the surface of the skin, it can immediately play a protective role. Of course, as the time on the skin surface prolongs, a more uniform sunscreen may form, but I don't think this has a decisive influence on the sunscreen effect. So, sleep for 30 minutes in the morning, this is a valuable wealth!
7, sunscreen only sunscreen is enough
Purple, blue, and invisible near-infrared rays in visible light can cause UV-like damage to the skin, so sunscreen is not enough. Sunscreen does not mean that all sunscreen, must adhere to the ABC principle of sunscreen, that is, sunscreen → hat clothes umbrella sunglasses and other hard sunscreen → the last is the sunscreen to pick up the leak.
8, apply sunscreen to the computer
Three words: No! need! want! The computer does not emit ultraviolet light, and there is no ultraviolet light to reflect, so there is no need to apply isolation and sun protection to the computer. The focus is on moisturizing to cope with the accelerated loss of moisture from the computer's thermal radiation.
9, moonlight UV is stronger, also apply sunscreen at night
After more than 5:00 in the summer, the ultraviolet light in the daylight can be neglected. The moonlight comes from the reflection of the sun. It is a joke to say that such a weak light contains more ultraviolet light.
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