First, I think it is very important to talk about the formation of the crossed eyes, which should start from the muscles and nerves that control the movement of the eyes. At the surface of the eyeballs, there are 6 extraocular muscles. Usually, under the control of nerves, they work coordinately. That’s if why normal person watch things at the left side, their eyeballs will move to the left side together. Watch things at right side, eyeballs move to the right side. However, if the muscles lose their balance, and the nerves are numb, crossed eyes may happen. So if people do not cure their crossed eyes in time, the numbness of muscles and nerves may not be healthy again. To cure crossed eyes, you need to consult your doctor. Generally speaking, you can have a professional pair of glasses to correct the crossed eyes or do an operation.