Cyclic Esotropia
Cyclic esotropia is a rare form of non-accommodative convergent strabismus which present as 24-hour period of straight eye position followed by 24 hours of large-angle esotropia1. Burian in 1958 described Cyclic esotropia for the first time in English literature2. Duke-Elder3 described the “Cyclic Squint” as a “rare and curious condition which invariably takes the form of a temporary esotropia.” Etiopathogenesis/Theories The etiology of this rare form of convergent strabismus is unknown. Possible theories behind the evolution of such a strabismus include progressive loss of compensation of a latent strabismus, change of a central clock mechanism, and incomplete cerebral dominance, with interhemispheric conflict1 spontaneously or may be precipitated by a trigger. The trigger can be traumatic brain injury, strabismus surgery, extracapsular cataract surgery, retinal detachment with scleral buckling, orbital surgery and ocular trauma 4 . However, many cases have been associated with other

