Crossing your eyes, however, cannot cause any permanent damage. Your eyes are meant to come closer together and they will always return to their normal placement when you're done clowning around.

Is it bad to cross eyes?

While this may cause adults to worry, it won't cause any permanent damage. Crossing your eyes can cause muscle fatigue (much like when you exercise any other muscle), but it won't have any lasting effect.

Is it normal for your eyes to cross?

The condition is more common in children, but it can also occur later in life. In older children and adults, crossed eyes can be caused by a variety of underlying medical conditions, like cerebral palsy or stroke. Crossed eyes can usually be corrected with corrective lenses, surgery, or a combination of both.