No, eyeglasses only focus the light so that it will land in your eyes correctly. When your prescription changes, it's because your eyes have grown, and now the eyeglasses need to be replaced to refocus the light. Once your eyes are done growing, you will hardly need any prescription changes. Although, if you think about it, eyeglasses can indirectly affect the shape of your eyes. Without eyeglasses, you might squint, causing a change in the shape of your eyeball. Then, when you put on your eyeglasses, you won't squint anymore, and the eye balls can take their regular shape.