Having delicate and flawless white and tender skin is the first desire of many women who love beauty. However, recently, there has been a rumor on the Internet that “long-term use of mobile phones and computers and long-term exposure to blue light may make your skin dark and old.” this makes many office workers and bow heads quite nervous. But is it really the case? Dermatologists will solve all the questions one by one and teach you how to correctly sunscreen!
does blue light from mobile phones harm skin aging? Doctor: ultraviolet long wave (UVA) is the culprit
Dr. Yang Lizhen, a dermatologist at Taipei Chang Gung Memorial Hospital, said that mobile phones and computer screens do emit a certain amount of blue light. Because the luminous area is not large, it mainly belongs to short wavelength invisible light. Therefore, it will not cause damage to the skin like the above rumors. In fact, the real culprit that leads to inexplicable tanning and aging indoors is long wave UVA with strong penetration in ultraviolet rays.
strong penetration, ultraviolet long wave (UVA) is more harmful to skin
Why is ultraviolet long wave UVA so terrible? Dr. Yang Lizhen explained that ultraviolet light can be simply divided into two types, UVA and UVB, according to the length of wavelength and the strength of penetration. Among them, UVB is one of the causes of sunburn and redness; However, due to its short wavelength, the building glass can effectively resist and will not enter the room, which has little impact on office workers who stay indoors most of the time.
As for UVA, because of its long wavelength, it can not only pass through clouds and glass, but also reach the human skin’s dermis all year round, whether it’s sunny or rainy. It can promote the proliferation of free radicals, cause chronic inflammation, affect the skin’s condition, and even produce “photoaging” reactions such as pigmentation, black spots, darkness, wrinkles, etc. the harm to the skin can not be underestimated.
have you selected the right sunscreen? Anti long wave UVA, see PA index
Even indoors, sun protection measures are still sloppy! Dr. Yang Lizhen pointed out that in order to effectively block the threat of ultraviolet long wave UVA, more efforts should be made in the selection of sunscreen products. When buying sunscreen products, in addition to paying attention to the SPF index for protecting against acute sunburn and sunburn, you should also pay attention to whether there is a PA (PPD) index for preventing sunburn, and whether it can effectively prevent the interference of long wave UVA, which is more guaranteed for maintaining skin health.
apply sunscreen don’t be stingy, resist ultraviolet rays, and don’t forget to fully supplement it.
In addition to the correct selection of sunscreen products, how to use sunscreen products correctly is also important! Dr. Yang Lizhen reminds that ultraviolet radiation, whether it’s sunny or rainy, lasts all year round. It’s better to suggest that people wear sunscreen products when they go out after basic maintenance.
To achieve better protection, sunscreen products should be fully applied. Generally speaking, at least 2ml of lotion should be used per square centimeter, which is equivalent to 2 peanuts for the whole face. In addition, once you sweat, or when you are engaged in outdoor activities such as outings, swimming, and mountain climbing, you should replenish the sunscreen every 2 to 3 hours according to the situation, so as not to cause a large amount of loss of sunscreen ingredients in the process of capturing “light particles”, which will greatly reduce its protective effect.
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