Find glasses that filter out UV-A and UV-B rays (they don't have to be expensive). Look for a label that specifically states they offer 99 or 100 percent UV protection. An eye-care pro can test them if you're unsure.
Made in the Shade
Sunglasses should be dark enough to reduce glare, but not dark enough to distort colors (which could affect the recognition of traffic signals). Tint is a matter of personal preference.
People with contacts made with UV protection should still wear sunglasses.
Hide Under a Hat
Since UV rays can still enter from the sides and top of sunglasses, it's smart to wear a hat with a three-inch brim to help block light.