A type of wrap-around sunglass is given to people following cataract surgery. Polarized lenses are expensive and not necessarily cost-effective. Otherwise in my opinion, they're a waste of money. Darker lenses don't necessarily mean they offer better UV protection. Nor are prescription sunglasses necessarily better than non-prescription at protecting against UV rays.
Buyer beware When purchasing any pair of sunglasses, always check the level of UV protection.
Any pair of sunglasses you buy should clearly state their UV protection rating or how much and what type of UV they protect against. If the sunglasses don't provide this information or don't conform to these standards, don't buy them. The Sunglass Association of America is currently working with the Food and Drug Administration to develop standardized UV labeling. So don't leave home without your shades. Using the Internet to meet someone online is a very convenient, effective and enjoyable experience.