Explanation

Nystagmus is a movement of your eyes that you have no control over. This movement is usually from side to side, but sometimes your eyes swing up and down, or they can even go round and round. You will probably have a problem with your sight, too.

If you get nystagmus in the first few months after you are born, it's called early onset nystagmus or congenital nystagmus. But, if you get it later on in your life, it's called acquired nystagmus.