Blue light is not unique to sunglasses factory electronic products, it is also present in natural light, usually with a wavelength of about 400-500nm. Blue light is also divided into beneficial and harmful. The wavelength in the range of 400~450nm is harmful blue light, while the range of 450~500nm is beneficial blue light. But there is still a part of blue light that is beneficial to our human body, that is, blue light with a wavelength of about 480nm. It can adjust biological rhythms and is helpful for sleep, mood, and memory. In addition, experiments have confirmed that daily outdoor activities in sunlight can effectively prevent the occurrence of myopia, in which short-wavelength blue light may play an important role.

Harmful blue light has high energy and can pass through the lens to the retina. A large enough dose will cause the atrophy or death of pigment epithelial cells and accelerate the oxidative aging of cells in the macular area of ​​the retina; it will increase the amount of macular in the eye, leading to macular degeneration; although the lens itself It has a certain ability to absorb blue light, but too much absorption can also lead to lens degeneration, which may cause cataracts or even blindness. Its damage to the eye is gradually accumulated, so there is a yellow intraocular lens for senile cataract patients, which absorbs blue light, reduces phototoxicity to the retina as much as possible, and protects the fundus of the elderly.

In addition to the blue light that exists in natural light , In energy-saving lamps, fluorescent lamps, computer monitors, mobile phones, digital products and other video terminals will emit blue light due to the use of light-emitting diodes, so in recent years, it has caused heated discussions in the mass media and academia that blue light may affect eye health. The eye has evolved to have many protective mechanisms against blue light damage. For example, squinting, pupil constriction, lutein contained in the macula, the retina's own antioxidant repair mechanism, etc., and the blue light emitted by electronic products is a few percent of the blue light intensity in natural light. That is to say, as long as electronic products are not used continuously in a large amount every day (for example, more than 8-10 hours a day), blue light will not cause obvious damage to the eyes.

Wearing anti-blue light glasses incorrectly will even hurt your eyes, because unqualified blue light glasses will filter out all blue light, including beneficial blue light, which will affect our sleep and mood. Usually, blue light-blocking glasses are yellowish. This obvious chromatic aberration may affect the judgment of color, which is not suitable for art and chemical majors, and can also cause serious visual fatigue. The aggravation of visual fatigue will not control myopia, but will accelerate the progression of myopia. The most important thing is that if parents have the misunderstanding that "anti-blue light glasses can control myopia" in their minds, and think that wearing anti-blue light glasses can allow children to use electronic products without guidance and control, myopia will definitely progress.