What meaning is eyeglass UV400？
Sunglass is to be able to protect an eye not only, still can bask in bask in of course the most important is very cool, so what meaning is sunglass uv400?What does it do?
Sunglass UV400:
"UV400" : that is, the wavelength of the ultraviolet light below 400nm through 2 the lens of the average transmission ratio is not more than 2%.
According to wavelength, sunlight can be divided into ultraviolet UV(100-400nm), visible light(400-800nm) and infrared IR(above 800nm). Among them, ultraviolet light in the region between 315-400nm is called ultraviolet A, which is one of the causes of cataracts.The 280-315nm section is called ultraviolet B, which is one of the causes of acute keratoconjunctivitis.Ultraviolet C below 280nm is extremely harmful to the growth and development of animals and plants on earth. Fortunately, most of it will be filtered out by the ozone layer.In recent years, with the deterioration of the living environment of the earth, the ozone layer has been destroyed, ultraviolet C whitening has also attracted people's attention.
What effect does sunglass uv400 have:
UV400 refers to the anti-ultraviolet coefficient, and UV400 lens is the best type of anti-ultraviolet coefficient lens, it compared with other types, is the highest anti-ultraviolet coefficient lens.People often say that polarized lens, its anti-ultraviolet coefficient is also very high, but it is mainly anti-strong light and glare, if you want to 100% anti-ultraviolet, UV400 lens is the best, but also the highest.For frequent outdoor activities such as fishing, skiing and driving, UV400 lenses are a good idea.
UV400 lenses can block 100% of the invisible UV rays, which is their greatest benefit.To put it simply, it can control the transmittance of light with a wavelength of 400nm or less within 5%, reducing the exposure of ultraviolet light and preventing people from eye diseases such as cataract, conjunctival macular and retinitis.Some special addition of hardening and dust prevention system, not only improve the clarity of vision, but also increase the service life of the lens, and greatly improve the lens hardness, tenacious resistance to scratches.
Okay, now you know what UV400 sunglasses do.
