UV PROTECTION | Look for the label

Statements about blocking infrared rays and blue-blocking have nothing to do with UV protection and may not prevent eye damage.
The term "polarized" means that the sunglass lenses reduce reflected glare but are not necessarily protective against UV light, unless the sunglasses contain a UV statement, too.
Darkly tinted lenses do not guarantee UV protection, nor does mirror coating. Look for a UV statement.
Wrap-around sunglasses provide extra protection. Enough UV rays can enter around ordinary (nonwraparound) eyeglass frames to damage your eyes.
Ensure the lens itself was ground and polished properly. Do this by trying on the sunglasses and placing a hand over one eye. Look at a straight line (tile floor, side of a cabinet) and slowly move your head from side to side, then up and down. The lenses are good if the lines stay straight. Try on another pair of sunglasses if the lines wiggle at all.
Some contact lenses have UV protection. If yours don't have UV protection, remember to wear UV-blocking sunglasses.