In summer, many people like to wear sunglasses when they go out for the sun. However, have you noticed the "shelf life" of sunglasses? And do you know the overdue sunglasses would harm to our eyes? OK, let's take a look together!!👇👇 According to a new study, the "shelf life" of a pair of sunglasses is about 2 years. After "expiration", sunglasses are likely to lose its protective eye. The British media quoted researchers at the University of São Paulo in Brazil as saying that long-term exposure to sunlight in the lens will reduce the ability to prevent UV rays. If it is not replaced for a long time, it will easily cause damage to the cornea and cause vision problems. ST947 Research suggests that exposure to the sun may degrade your sunglasses, the lens may become lighter, and reduce the lens's resistance to resistance, which is the lens's shatterproof index. The World Health Organization has published "UV...