u003cbru003eIn the hot summer, many people wear sun
glasses, which can protect their eyes and are more fashionable. However, if the lens is not selected properly, it will cause retinopathy. It is recommended to choose sun
glasses in colors of gray, brown, etc., to play a protective role, and do not choose blue lenses. The color of
sunglasses is not as dark as possible, and there are colors that you absolutely cannot choose. When buying
sunglasses, you must recognize that there is a UV400 logo on the trademark. You can also take the glasses to a special institution for UV protection testing. According to experts, ultraviolet light is abbreviated as UV. The two light waves of UVA and UVB, if exposed to the human body for a long time, will not only cause skin sunburn and skin cancer, but also damage the cornea, retina and vitreous body of the eye. Because it is invisible light, it is easily invisible Accumulated damage to the eyes will cause problems such as cataracts and macular degeneration in the long term. Studies have shown that long-term exposure to UVB light waves will increase the risk of cataracts by three times, and may cause other eye diseases and even blindness. The key to eye protection for sunglasses lies in whether the lenses can effectively block ultraviolet rays. Gray, dark green, and brown lenses are currently recognized as having a protective effect, while other colors are mostly 'not good for use' and even cause more damage to the eyes. Spectacles and ophthalmologists recommend that you do not choose blue lenses when choosing sunglasses. As age grows, there are more and more photosensitive compounds in some retinal cells, and the wavelength of the blue part of the spectrum can activate these compounds to the greatest extent and promote the release of harmful free radicals (harmful compounds produced in the body's oxidation reaction) . Blue lenses will pick out harmful blue light into the eyeballs, while yellow and amber lenses can filter blue light to prevent it from harming the eyes.
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