Have you noticed the 'shelf life' of sunglasses?

u003cbru003eThe hot summer has not passed, and the sun is 'unscrupulous'. Many people like to wear glasses.com/sunglasses-1.html' target='_blank'>sunglasses when going out for sun protection. However, have you ever paid attention to the 'shelf life' of sunglasses? According to a recent study, the 'shelf life' of a pair of sunglasses is about 2 years. After the 'expirationRecommended reading: Popular science: why children need to wear sunglasses more than adults. British media quoted researchers from the University of São Paulo in Brazil as saying that long-term exposure to sunlight will reduce the ability to protect against ultraviolet rays. If not replaced for a long time, it is easy to damage the cornea , Causing vision problems. Studies have stated that exposure to the sun may degrade your sunglasses, the lenses may become lighter, and the resistance of the lenses, which is the shatter-resistant index of the lenses. The World Health Organization published an article 'Ultraviolet Radiation and Human HealthUltraviolet rays can also cause other serious eye diseases-keratitis, retinal destruction, cataracts, macular degeneration, snow blindness, etc. Therefore, sunglasses that can filter ultraviolet light have become important equipment for protecting our eyes in the sun. Researchers conducted simulation experiments in Europe, Australia, New Zealand and South America. They placed sunglasses under a solar simulator at a distance of 30 centimeters from the light-emitting point for 50 hours of continuous 'exposure in the sunThe results of the experiment show that due to the differences in sunlight in different parts of the world, sunglasses in tropical countries and regions with the highest levels of ultraviolet rays, the UV protection function will degrade more quickly. According to the study, the degradation of sunglasses varies with latitude. The tropical UV index is particularly high in summer and will not decrease in winter. Researchers suggest that it is best to change to a new pair when buying sunglasses for more than two years. Finally, remind everyone that you must choose a pair of sunglasses that suits you and change it regularly, and don't let sunglasses become an invisible killer of your eyes. Related Reading: Fashion Sunglasses Sunglasses

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