Make sure you choose sunglasses with protection from ultraviolet, and you determine the shape of your face before you step out to shop for them, says an expert. Ganesh Iyer, Country Head at Coolwinks, an online portal for purchasing quality eyewear, rolled out a few tips for you to buy the right kind of sunglasses: The ultimate aim of using sunglasses is to protect your eyes from ultraviolet light emitting from sun. Don't let this reason sit on the backseat and make sure your sunglasses provide UV protection.