Did you know that sunglasses, or at least sunglass lenses, regularly need to be replaced?
According to a study conducted at the University of São Paulo, the UV protection that sunglasses provide deteriorates over time. You may adore your current ones, but if you’ve been rocking those shades for two or more years, it might be time to get a new pair.
In addition to the UV-blocking properties, anti-reflective and anti-scratch coatings wear down, and the frame material may become brittle over the years, too. Even if you have the most durable sunglasses available, regular lens-replacement is the best way to ensure that your vision is maximally protected from the harmful effects of ultraviolet light.
Signs You Need New Sunglasses
Scratched Lens Coating:
Sunglass lenses have a protective coating of dyes and pigments that absorb UV radiation. Over time, this coating can break down. Any scratches or damages to the lenses affect the outer coating and therefore, the UV protection.
Faded Lens Coating:
The dyes and pigments that make up the protective coating on your sunglasses are designed to absorb the radiation from the sun. However, they can’t absorb forever. The more you wear them, the less radiation they will be able to absorb.
New Technology:
Technology is forever changing and advancing. Improvements are constantly being made to sunglass frames and lenses. Don’t be afraid to try different types of lenses for your sunglasses.
Out of Style:
Different types of frames can go in and out of style. If you are the type that likes to stay on top of the latest fashion trend, you will want to trade in your sunglasses for new styles.
UV Light and Sunglasses
The protective efficacy of your sunglasses comes in large part from the lens coating of dyes and pigments that reflect and absorb ultraviolet radiation. They create a barrier that prevents UV radiation from penetrating your eyes.
However, this protective coating can, and often does, break down over time. Wear and tear can cause an invisible web of tiny abrasions, compromising its UV-blocking power. Furthermore, the protective dyes and pigments aren't able to absorb UV rays indefinitely; the more sunlight they’re exposed to, the more rapidly they’ll become ineffective.
A pair of shades worn on occasion and in mild conditions is likely to remain effective longer than a pair that is heavily used in a more intensely sunny environment. For example, if you spend long days on the water paddling, kayaking, or canoeing, the protective coating on your lenses will deteriorate more quickly than it would if you only wear your shades to go grocery shopping or sit in a cafe.
Why It's Important to Protect Your Eyes From UV
Protecting your eyes from the sun is critical no matter where in the world you are, as UV exposure places you at risk for developing eye diseases like eye cancer, pterygium, and pinguecula — which can result in disfigurement and discomfort — as well as cataracts and macular degeneration — which cause vision loss and, in severe cases, blindness.
Even short-term overexposure can result in photokeratitis, a corneal sunburn. Symptoms include eye pain, swelling, light sensitivity, and temporary vision loss. Some people experience it when spending too much time boating or skiing without wearing eye protection. Snow and water can increase solar exposure because they reflect sunlight toward your face.
What to Look for When Getting New Sunglasses
When choosing new sunglasses, make sure they’re labeled 100% UV protection or UV400. Although most pairs sold in the United States and Canada offer this degree of protection, it’s still worth confirming before making the purchase. Keep in mind that factors like cost, polarization, lens color, or darkness don’t have much to do with the level of UV protection. Even clear prescription lenses can be UV protective.
It's important to note that there is a lot of counterfeit sunwear in the marketplace. This is dangerous since counterfeit eyewear may not provide much-needed ultraviolet protection. So if the price of a renowned brand is too good to be true, it's probably a fake.
The size and fit of the sunglasses is important. Bigger is definitely better if you spend a lot of time outdoors. Larger wrap-around eyewear is best if you regularly ski or spend many hours in the water, as this style blocks light from all directions.
To find out whether it's still safe to wear your favorite shades, visit a Fairfax eye doctor to determine whether your lenses still offer the right level of UV protection. It’s also a good opportunity to discuss prescription sunwear.
For more information about UV safety, or to get the perfect sunglasses tailored to your vision needs and lifestyle, contact Golden Eye Otometry today!
Sources:
- Equivalence between solar irradiance and solar simulators in aging tests of sunglasses
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At Golden Eye Optometry, we view good vision care as front line protection at every age. A routine eye exam can detect more than poor vision. It can shed early light on glaucoma, macular degeneration, cataracts and diabetes.
