Deciding on the right frames should be a combination of functionality and style. Different frames complement specific face shapes and it is important to work with your optician to determine which glasses are going to look best on you. First, you need to understand the different face shapes and which one you have, then you can choose the right frame. Cat eye glasses suit those with oval, square, and diamond face shapes, oversized and aviator shapes are flattering on most people, and square glasses are ideal for oval, round, and oblong face shapes.