Sunglasses are differentiated from prescription glasses by their unique function of providing wearers with attractive image as well as extra eye protection. In the open air and under the fierce sunlight, sunglasses are especially useful to offer wearers eye protection. In general, sunglasses to be worn everyday are not the same as those that are worn by experts like basketball players and swimmers. Sunglasses to be worn everyday can be in the style of prescription glasses which will not make you too eye appealing in the public or at work. So sunglasses with glasses frames like round, square, big, small, rimless, half and full rim, and any irregular shape are all your choices. As to how to choose the right one, you'd better pick up one according to your face shape. For example, if your face is round and short, you should not choose too big one.