Acquired monocular elevation deficit in a case of Parry-Romberg syndrome.

The authors describe a patient with Parry-Romberg syndrome (PRS) who had acquired monocular elevation deficit (MED), ptosis, and facial hemiatrophy. A 12-year-old female patient manifested progressive ptosis and hypotropia companied with progressive hemifacial atrophy was conducted to the ophthalmology clinic for diagnosis and treatment. Forced duction and generation testing confirmed that her incomitant hypotropia was caused by paralytic muscles and not due to restriction, so it was diagnosed as MED. Knapp procedure was conducted to correct her eye positions. Six months later, the frontal muscle suspension surgery was performed to treat her ptosis. Postoperatively, the patient had orthotropia without residual left hypotropia in the primary position and her left upper eyelid function improved significantly. The ocular motor defect, in this case, is best explained by nerve paresis rather than muscle fibrosis.