Our eyes stop growing at some point during our youth. It is when our eyes grow too long that we develop myopia. The reason your eye sight is consistent is bec

Our eyes stop growing at some point during our youth. It is when our eyes grow too long that we develop myopia. The reason your eye sight is consistent is because your eyes are the longest they will ever be. As we age, our lenses harden, we lose the ability to focus, and sometimes our eyes shrink. In myopic people, these process will result in an "improvement" in their eye sight, while people with good eyesight will develop hyperopia when these processes happen. I believe the latest research points to lack of outdoor activities as the source of myopia in children. UV light appears to play a part in regulating the growth of our eyes, preventing them from growing too long.