Do sunglasses really protect your eyes from sunlight?

Have you ever stepped outside your cool, dark house in the middle of summer only to be instantly blinded by the blazing midday sun? It’s a humbling experience, to say the least. One minute, you’re taking out the garbage like usual. The next, you’re frozen on the doorstep like a deer-in-headlights, blinking profusely as the neighbors watch with concerned looks. 

As you wonder if your eyes will stay like this forever, you remember those $12 gas station sunglasses right inside the door. Hallelujah! Your eyes are saved. But did that unfortunate staring contest with the sun cause damage? And does wearing sunglasses actually provide any protection? Let’s find out. 

First, how bad is sunlight for your eyes? 

“Outlook, not so good.” According to our sources. (Yes, “sources” in this case means our Magic 8 Ball.) While being exposed to sunlight in small amounts can be a good thing, supporting the body’s natural circadian rhythm and boosting Vitamin D levels, too much of it can be problematic. The sun produces energy called ultraviolet (UV) radiation, and any exposure to your eyes can increase your risk for macular degeneration, one of the leading causes of age-related blindness. It’s also linked to eye cancer and Photokeratitis (a type of sunburn in the eyes that causes blotchy vision... ouch), so it’s important to keep your eyes protected when you’re outside. 

Are sunglasses the way to go? 

Absolutely. But it’s important to know that not all shades are created equal. Just because your sunglasses are dark, doesn’t mean they block out all the UV rays. To find the most effective types of sunglasses, look for ones that are designed to block out both types of UV rays: UVA (which penetrates deeper into the tissues) and UVB (which is the primary cause for sunburns).  

How do I know if my sunglasses are protective? 

Look at the labels. A protective pair of sunglasses should indicate that it blocks at least 99 to 100% UVA and UVB rays (like The Framery sunglasses here). You may occasionally see "100 percent UV 400 protection,” which sounds confusing but still means 100% UV ray blockage. 

Not sure about your sunglasses? Take them to an optical shop. They often have a UV light meter that can test your sunglasses for UV protection. 

How to buy the right sunglasses 

• Think oversized. The more coverage your eyes have from the front and sides, the less sun damage they are likely to get.  
• You don’t need to spend an arm or leg to get the coverage you want. As long as they’re 100% UV blocking, they should be just as effective as more expensive options. 
• Go for polarized. Polarization lenses reduce the glare that reflects off surfaces like water or concrete. They don't offer more protection from the sun but can make certain activities like driving or water sports more comfortable and safer. (Liingo’s prescription and non-prescription sunglasses are all polarized!) 

Best times to wear sunglasses 

Sun protection goes beyond just the summer months. Sunrays can bounce off sand, snow, water, and ice, almost doubling the UV rays your eyes are typically exposed to, so it’s crucial to wear protective sunglasses anytime you plan on being outside for extended amounts of time, regardless of the season.  

Sources: 
1. https://www.webmd.com/eye-health/sunglasses-protect-eyes