If you have a favorite pair of sunglasses, you've probably been using them for years.Can sunglasses that have been used for a long time still protect your eyes from the damaging effects of ultraviolet light (UV)?
The study did not directly answer the question of whether UV protection has worsened.The only way to know for sure is to test your sunglasses.
Sunglasses with the recommended protection will filter out all UV rays.Ultraviolet radiation can damage the surface tissues of the eye, the cornea and lens.Over time, UV damage can increase the risk of cataracts, macular degeneration and other eye diseases.These conditions can reduce your vision.
A 2016 study from the University of Sao Paulo in Brazil tested whether sunglasses were adequately protected from UV rays."It's different than testing to see if UV protection in sunglasses disappears," said Dr. Jeff Pettey, an assistant professor of ophthalmology at Moran Central University in Utah and a spokesman for the American Academy of Ophthalmology.
The researchers found that the Brazilian manufacturer's tests may underestimate the amount of UV exposure the glasses would cause over time.It's not clear what the findings mean for the U.S. sunglasses test.Brazil has higher rates of exposure to UV radiation than the United States.
While the study raises more questions than answers, Dr Pettey says consumers should not panic or rush to change their favourite shades.No one is suggesting using sunglasses when you retire.
Ultraviolet blocking technology has improved in recent years.Most sunglasses today have UV protection built into the lens, rather than painted onto it.If you are concerned about the age and safety of your sunglasses, you can have them tested at an optician with an ultraviolet light meter.
If you're ready to buy a new pair of sunglasses, Dr. Pettey offers these tips for choosing the most protective sunglasses: Look for a label that says "100% UVA and UVB protection" or "100% UV-400 protection."Choose a larger frame that covers the eyes and surrounding skin.A frame that wraps around both sides of the face provides maximum protection.
