ABSTRACT

Cyclic esotropia is a rare form of strabismus characterized by alternating periods of esotropia and orthophoric (or almost orthophoric) eye position. Herein, we discuss two children with cyclic esotropia and their surgical treatment results. A six-year-old boy was brought to our clinic with the typical complaint of a convergent squint which had been appearing and disappearing in a regular 24-hour cycle over a period of four years. He had a large deviation angle with associated suppression and no binocular function for a 24-hour cyclic pattern, but he had a small angle of esotropia with fusion and stereopsis for another 24 hours. He had undergone strabismus surgery on the left eye at another clinic 3 years ago. The other patient was a ten-year-old girl who was brought to our clinic with the reoccurring complaint of esotropia on alternating days over a period of four years. We determined that a large deviation angle with near-distance disparity and a 24-hour cyclic pattern were present. For both cases, we planned strabismus surgery according to the amount of deviation on the esotropic day. Following the surgery, the eyes have continued to remain permanently straight during the follow-up period.