The statement that blue light from artificial light sources such as cell phones may harm the skin is correct. The so-called blue light is visible light range of wavelengths between 400nm-500nm, high-energy blue light wavelengths in 450nm-470nm. blue light exists in outdoor sunlight, LED lights, cell phones, computers, TVs and other electronic devices, and electronic devices have a cumulative effect of blue light, prolonged exposure to blue light may bring varying degrees of damage to the skin. 1, leading to pigmentation blue light The penetrating power of the skin is strong, long time irradiation will hurt the basal layer of the skin, the basal layer may already contain a lot of melanin, which is more likely to lead to pigmentation, skin dullness, but also easier to form pigmentation; 2, accelerate skin aging blue light can penetrate the epidermis and dermis of the skin, causing oxidative damage to cellular DNA, cell phones and other artificial light sources occurring in the blue light can make the skin active aerobic free radicals, in the Free radicals under the action of collagen will react, so that the skin gradually lose elasticity, wrinkles and aging; 3, causing dry skin blue light will affect the skin moisture transfer, affecting the skin’s ability to lock water, easy to make the skin dry, and even peeling phenomenon; 4, inhibit melatonin secretion if the use of cell phones, computers and other electronic devices before going to bed, blue light will inhibit melatonin secretion in the body, the organism will also In an excited state, affecting the quality of sleep, indirectly affecting skin health; 5, damage to the eye area and eye structure young people due to stay up late playing electronic products, irregular rest and rest, etc. resulting in sleep deprivation, may make the blood around the eye oxygen changes, blood oxygen red blood cells reduced, resulting in dark skin color around the eyes, the formation of dark circles. In addition, blue light can penetrate the lens and reach the retina, which will increase the chance of macular degeneration in the eye. Prolonged exposure to blue light can also produce visual fatigue, leading to myopia deepening and so on. Therefore, it is recommended to avoid prolonged application of cell phones, computers and other electronic products with artificial light, daytime skin care, apply skin care products with anti-blue light effect, to a certain extent can protect the skin and resist blue light stimulation. Of course, despite the use of related products, only to a certain extent to reduce damage, and can not completely avoid damage, therefore, it is not recommended to receive blue light stimulation for a long time.