Exotropia is a form of strabismus where the eyes are deviated outward. It is the opposite of esotropia , in which the eyes are deviated inward. People with exotropia often experience crossed diplopia (double vision), loss of depth perception and binocular vision.

 

This is because the brain's ability to see three-dimensional objects depends on proper alignment of the eyes. When one eye turns inward, outward, upward, or downward, two different pictures are sent to the brain instead of a fusion into one single image.