Consecutive Cyclic Esotropia Following Surgery for Intermittent Exotropia

ABSTRACT

Cyclic esotropia is a rare condition, first mentioned by Burian in 1958, in which orthophoria is regularly followed by constant deviation on rhythmic pattern. The periodicity would suggest a biologial clock mechanism. Consecutive cyclic esotropia following strabismus surgery is extremely rare. Only three cases of consecutive cyclic esotropia following surgery for intermittent exotropia have been reported We report one case of consecutive cyclic esotropia in an 8-year-old girl who underwent surgery for intermittent exotropia. The periodic esodeviation was treated with bimedial rectus recession. We suggest the overcorrection after surgery for intermittent exotropia would cause the periodicity by biological clock mechanism when the biorhythm of the patient is in an unstable and dangerous state.