How much do you know about sunglasses

u003cbru003eWe have all studied spectroscopy in middle school physics. To put it simply, the wavelength range of visible light we see is 380~780nm. For this part of light, the role of sunglasses is to reduce light transmission and reduce the glare of the eyes in summer . For the part of the wavelength range 100~380nm that we can't see, that is, ultraviolet light, its impact on our eyes is actually much greater than the strong light of the hot sun. For the eyes, exposure to ultraviolet light for a long time can easily lead to chronic eye diseases such as cataracts and macular degeneration. Some may also develop symptoms such as eye pain, photophobia, decreased vision, and corneal edema in a short time. So in summer, you need a pair of sunglasses to block strong light and ultraviolet rays. YC9708 Universal Sunglasses C7 Black Frame Silver Legs/Lens Gray UV Protection is a necessary function of sunglasses. It has nothing to do with the lens color and light transmittance. It is usually realized by coating, usually in the following 3 ways: 1. Mark 'UV400' : This means that the lens can block ultraviolet rays and visible light with a wavelength below 400nm; as long as the ultraviolet rays passing through the lens are less than 2%, it is considered qualified; 2. Mark 'UV' and 'UV protection': This means that the lens can block ultraviolet rays below 380nm ; As long as the ultraviolet rays passing through the lens are less than 2%, it is considered qualified; 3. Mark '100% UV absorption': This means that the lens has 100% absorption of ultraviolet rays; but in fact, the ultraviolet rays passing through the lens are less than 0.5%, even if qualified. Regardless of other factors, when choosing anti-ultraviolet sunglasses, you can buy according to the above 3 points. And under normal circumstances, there will be a note on the spectacle tag. Generally, polarized sunglasses have better UV protection. Sunglasses are not just a cool and handsome accessory, they are also a special tool to protect the eyes from harm. In fact, the functions of sunglasses are much more than these, but you don't know it yet. If you want to know more about the powerful functions of sunglasses, you can pay attention. The Encyclopedia of Glasses is here waiting for you! Related reading: Sunglasses Polarized Sunglasses

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