Well, online eyeglasses stores can provide you with a pair of glasses. But you can buy frames or lenses from them too. If you a frame at hand or you want to install new lenses with old frame, you can order lenses online. And then ask an optician in your local place to install the lenses for you. If you want to buy the frame to decorate yourself, you can buy the frame only. But I won't suggest you to buy a pair of lenses online because you don't know whether this kind of lenses fit your frame or not. There are some frames that need particular lenses because they have different arc.