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Why You Regularly Need to Replace Your Sunglasses

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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 Vancouver Island 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 Valley Vision Optometry in Vancouver Island today!  

 

References 

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

 

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COVID-19 UPDATE

The following is a summary of the steps we have taken to protect your safety.

Physical Distancing Measures:

o Reducing density of people: We have adopted a schedule which will reduce the amount of patients in our facility at one time.

o We will have some of our team working from home operating a call centre and tele-medicine pre-screening.

o Spacing stickers have been placed on our floor.

Engineering controls:

o Forms have been digitized and will be emailed to patients in advance of the appointment to minimize contact.

o A “For Payment" button has been installed on our website, valleyvisionoptometry.ca for patients to be able to pay from home to minimize contact.

o Plexiglass barriers have been installed at all 3 Front Desk stations

o Our doors will remain locked during Phase 2, opening the door to let in scheduled patients only.

o A dropbox has been installed for patients to drop off glasses in need of repair.

o Contact lens sales are administered through our webstore.

Administrative controls:

o Cleaning protocols have been written. Staff training on these protocols has been scheduled.

o Clear rules are posted on our front door and throughout all of the stations in our office.

Personal protective equipment:

o Patients will be required to wear a mask upon entry to the office and throughout their time with us. Those who do not have a mask will be supplied a surgical mask upon entry.

Policies around sickness:

o Employees and patients with cold or flu symptoms will be required to stay home.

Frequent hand washing:

o Patients, Doctors, and our Team will be required to wash hands upon entry and exit in to the exam rooms.

o Eyewear Consultants will wear gloves when handling eyewear and performing adjustments.

We currently are operating a reduced schedule, so are triaging patients to ensure those with the highest needs are prioritized.

Sincerely,

Dr. Shaun Golemba

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