Sunglasses

Why You Regularly Need to Replace Your Sunglasses

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.

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 Edmonton 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 Dr. Barry Nolt Optometry in Edmonton today!

References

https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-016-0209-7

UV Safety Awareness Month

July is UV Safety Awareness Month, and no wonder! With the summer sun out in full force, it’s now more important than ever to protect your eyes from harmful UV rays.

During this month, people who have suffered from UV ray damage and their loved ones are encouraged to share their experiences and advice. Use the hashtag #UVSafetyAwareness on your social media channels to support others in your community.

Did You Know?

Your eyes can get sunburned. It isn’t only your skin that’s at risk, but your eyes, too. When your cornea is exposed to too much UV radiation, a condition known as keratitis can occur. Keratitis can actually cause a temporary loss of vision, often after using a tanning bed or being out in the sun too long. UV radiation can also cause small growths on the white part of your eye, which are called pterygium and pinguecula. They can make your eyes feel dry, irritated, and scratchy.

If you experience any of these symptoms, Dr. Barry Nolt Optometry can help.

UV ray exposure is a risk factor for eye conditions and diseases. In 20% of cataract cases, cataract growth has been linked to UV ray damage. Cataracts develop when the normally clear lens of the eye becomes cloudy. UVA rays are a known risk factor for macular degeneration – the leading cause of blindness in people over the age of 65. Macular degeneration occurs when the macula of the eye, which is responsible for clear central vision becomes damaged. It’s critical to be aware of UV ray exposure, especially if you or a family member are in this age group.

What Exactly Are UV Rays?

You may have heard about UV rays without knowing what they actually mean. UV stands for ultraviolet light. That’s a potentially harmful type of radiation, which is typically found in fluorescent lights, tanning booths. But its main source is from the sun, and it’s invisible to the naked eye, so you don’t even feel it as it touches your skin or body.

Why Are UV Rays Dangerous?

So why are they considered dangerous? Well, too much of a good thing isn’t really a good thing. Sunlight helps us make vitamin D, which is healthy. Too much sun exposure, though, can cause premature aging in the skin, burns in the eye, and may even change the shape of your cornea and other serious eye damage, leading to vision problems. It’s even more dangerous for younger people, especially children, because children’s lenses are more transparent and transmit UV rays more easily.

If you or a loved one is experiencing vision problems or eye diseases, we can help. Dr. Nolt sees patients from all over the Edmonton, Alberta area, and can treat your condition with a number of advanced solutions. Regular eye exams and checkups are critical for keeping your vision healthy, especially during the summer.

UV Safety Can Go a Long Way

Thankfully, it’s pretty easy to protect yourself from long-term exposure to UV rays. Check out our top 3 UV safety tips:

Put on Those Shades

Snag a pair of sunglasses with 100% UVA and UVB blocking power. Anything less than that won’t protect your eyes from harmful rays. Concerned about your look? Don’t worry, There are plenty of awesome sunglass designs, so you’ll protect your eyes without compromising on incredible style. Ask the optometrist which lens is best for you.

Sunscreen and More Sunscreen

Mothers and doctors say it all the time, and with good reason! Use sunscreen before going outdoors and make sure it has a good SPF (Sun Protection Factor) number. If you’re in the water, reapply it every 2 hours. UV rays can reflect off of water, so if you’re hitting the pool or beach, take extra precautions.

I Tip My Hat to You

Protect your head and the skin on your scalp with a hat. A wide-brimmed hat is best for a good amount of sun-blocking coverage, since it also protects the tops of your eyes which might not be shaded by your sunglasses, and is too sensitive for sunscreen. For the fashion-conscious, there are endless styles to choose from, so go shopping!

During this UV Safety Awareness Month, we encourage you to share your stories and successes. If you have any questions, Dr. Nolt is here to help.