To report a case of neovascular glaucoma secondary to ocular ischemic syndrome in a patient with moyamoya disease, who was successfully treated with trabeculectomy.

A 45-year-old woman suffered from slowly decreased vision in the right eye 3 months previously. Ocular pain with conjunctival injection of the right eye and headache developed 2 months earlier. She was diagnosed with moyamoya disease and had an encephaloduroarteriosynangiosis at the neurosurgery. The patient complained of persistent conjunctival injection and decreased vision of the right eye after surgery. At the initial visit, best corrected visual acuity (BCVA) of the right eye was 0.1 and intraocular pressure (IOP) was 42 mm Hg. Slit lamp examination revealed neovascularization of the iris and gonioscopy showed a 360° peripheral anterior synechiae. Fluorescein angiography demonstrated prolonged arteriovenous transit time in the right eye. On the electroretinogram, the amplitude of both a and b waves decreased in the right eye more than in the left eye. On the magnetic resonance angiography, narrowing of the right internal carotid artery was observed. The patient was diagnosed with neovascular glaucoma due to ocular ischemic syndrome caused by moyamoya disease. Panretinal photocoaguration, intravitreal bevacizumab injection and trabeculectomy with mitomycin-C soaking was performed in the right eye. At 8 months after surgery, BCVA of the right eye was 0.1, IOP was 17 mm Hg without antiglaucoma medication and bleb was maintained in good condition.

The patient's results indicate that neovascular glaucoma can occur secondary to ocular ischemic syndrome caused by moyamoya disease.