HIGHLIGHTS
SUMMARY
Classical cyclic esotropia has a 48-hour circadian rhythm of fixed orthophoria and esotropia that is associated with poor binocular function and suppression on "strabismic" days, though 24- to 96-hour cycles have also been described. The conventional treatment is by two-muscle surgery, bimedial rectus muscle recession with or without posterior fixation sutures, or a unilateral recession/resection procedure according to the manifest deviation on the esotropic day. The esotropia demonstrated a classical 48-hour cycle and showed circadian rhythm, appearing every alternating day without diplopia during the attack. Her eyes were orthotropic . . .
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