Ultrasound biomicroscopy in acetazolamide-induced myopic shift with appositional angle closure.

We report a case of a 49-year-old female who presented to the emergency department with blurred vision and vomiting, hours after taking two tablets of 250 mg of acetazolamide. The anterior chamber was bilaterally flat, with normal intraocular pressure in both eyes. An ultrasound biomicroscopic (UBM) examination showed bilateral ciliary effusion and complete appositional angle closure in all quadrants. Acetazolamide-induced bilateral angle closure was diagnosed. Steroid and cycloplegic therapy were initiated, and acetazolamide was discontinued. The following day, the anterior chamber had regained its volume without substantial change in the effusion size. Three weeks later, complete resolution of the ciliary effusion was verified by means of a third UBM scan.