Broadly defined as a misalignment of the eyes (they can’t point at a single object or focus together). It may be horizontal, vertical or comitant or incomitant, latent, manifest or intermittent. Phoria describes a latent deviation and Tropia the manifest deviations. Esotropia is inward deviation (crossed-eyes), exotropia is outward deviation. Hypertropia is upward deviation and hypotropia downward. Esotropia is a type of horizontal strabismus which is considered most common and can be infantile. Occlusive therapy is generally used to treat the Amblyopia before considering surgery. Muscle surgery is recommended to be performed within 6 months to 2 years of age. There are other forms of esotropia such as accommodative, acquired nonaccommodative and cyclical esotropia. Exotropia can be intermittent or constant and treatment involves corrective prisms and monocular occlusion. Muscle surgery may be considered. Vertical strabismus include Brown’s Syndrome and Double Elevator Palsy of which there are three types; Duane’s Retraction Syndrome and Mobius’ Syndrome are also forms of strabismus.