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.
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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 Radiation and Human
Health", which states that 5% of the 18 million people worldwide who are
blinded by cataracts each year are caused by ultraviolet radiation. Ultraviolet
rays can also cause other serious eye diseases - keratitis, retinal destruction,
cataracts, macular degeneration, and snow blindness. Therefore, sunglasses that
can filter ultraviolet rays are an important part of our ability to protect our
eyes in the sun.
The
researchers conducted simulations in Europe, Australia, New Zealand, and South
America, placing sunglasses under a daylight simulator, 30 cm from the point of
illumination, and continuing to "exposure" for 50 hours while
observing the degree of degradation of the lens' UV protection.
The
results of the experiment show that due to the different sunshine in different
regions of the world, sunglasses in the tropical regions and regions with the
highest UV levels will degrade faster.
According
to the study, the degradation of sunglasses
varies with latitude, and the
tropical UV index is particularly high in summer and not in winter. Researchers
suggest that it is best to replace a pair of new ones when buying sunglasses
for more than two years.
All
in all, be sure to choose a pair of sunglasses that suits you and change them
regularly. Don't let sunglasses become the stealth killer of your eyes. Enjoy your summer!!😺😺
Thank you for reading!!💖💖
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