Ocular Neuromyotonia Resolved with Oxcarbazepine

Ocular neuromyotonia is a disorder characterized by tonic contraction of one or more extraocular muscles. The pathophysiology is incompletely understood but thought to be due to damaged myelin sheath in ocular motor nerves, triggering crosstalk between adjacent axons, and subsequent prolonged electrical activity. Ocular neuromyotonia may be overlooked since the diagnosis requires examination of the sustained function of individual muscles. The condition usually improves with carbamazepine, but the side effect profile is often poorly tolerated. This case of ocular neuromyotonia is unique because it is one of few where oxcarbazepine was administered.