We use a laser pointer to stimulate Tardy and Shiloh, plus all the other kitties. We know that it won't cure the problem, but it does help them learn to compensate for it. Plus they love playing with the little red dot. Most of the other kitties don't like to play with Tardy, I think its because he tends to play real rough with them. So he is really eager to play with the dot. Please remember to NEVER point the laser at the eyes.