Acute Optic Neuropathy Developing During the Course of Behçet's Disease

A 48-year-old male had been diagnosed with Behcet's disease two years previously. During the remission period a sudden decrease in visual acuity developed in the right eye. Visual acuity in the right eye was 1/10. Relative afferent pupillary defect and impaired colour vision was detected. The anterior segment was normal. Fundus examination revealed right optic disk swelling. Neurological examination and magnetic resonance imaging were normal. Mega dose steroid therapy was initiated. Visual acuity began to improve after the third day and was 9/10 at the end of the first month of the therapy.