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Cyclical esotropia following surgery for partially accommodative esotropia.

Cyclic strabismus is a rare phenomenon characterised by recurring periods of heterotropia usually on alternate days. It was first described by Bohm in 18451 and classically follows a 48 hour cycle with 24 hours of “straight” eyes followed by 24 hours of manifest strabismus. It usually appears spontaneously although it has been reported in the aftermath of cataract, retinal detachment, and intracranial surgery.2–4 In addition there are two case reports of cyclical esotropia developing following strabismus surgery for intermittent exotropia5 and for infantile esotropia.6 However, there are no previous reports of this unusual condition developing after surgery for partially accommodative esotropia. We therefore present such a case.

A 14 year old girl was referred by her optometrist with an intermittent esotropia. Both the patient and her mother had noticed that the squint was present on some days but …