Experts agree that protecting your eyes from the sun is essential. Sunglasses act as sunscreen for your eyelids, the skin around your eyes, and the surface of the eyes themselves.
Sunlight contains UVA and UVB radiation. Both can increase your risk for serious conditions like cataracts, macular degeneration, and eye growths such as pterygium. Unprotected exposure also contributes to skin cancers on the eyelid and premature wrinkles from squinting.
Many people who wear prescription eyeglasses believe they need separate tinted lenses. However, most modern prescription frames are made from polycarbonate, which has built-in UV protection, or feature a special UV-blocking coating.
If carrying a second pair of glasses is inconvenient, it may not be necessary unless sunlight causes direct discomfort like eye fatigue or headaches. Brightness alone does not increase cancer risk.
For complete protection, sunglasses offer distinct advantages. They cover a larger area of your face and help relax eye muscles to prevent crow's feet. Experts recommend adding a hat and sunscreen for extensive time outdoors.
When shopping for any eyewear, look for a label that says “UV400” or “100 percent UVA/UVB protection.” Be cautious with very cheap, dark sunglasses without this protection, as they can cause pupils to dilate and absorb more damaging UV light.