The causes of<unk>  are not fully understood. Six muscles control eye movement, four that move the eye up and down and two that move it left and right. All these muscles must be coordinated and working properly for the brain to see a single image. When one or more of these muscles does not work properly, some form of strabismus may occur. Strabismus is more common in children with disorders that affect the brain such as cerebral palsy, Down syndrome, hydrocephalus, and brain tumors. One study has found that children with<unk>  are three times more likely to develop a psychiatric disorder in comparison with the general population.
Exotropia
Cyclotropia
Esotropia
Ocular dysmetria
Quadrantanopia
Heterotopia 
Presbyopia
Pseudomyopia