The whitish rings in the right eye faded during 2 weeks; however, the Goldmann visual fields remained unchanged. Multifocal electroretinography revealed depression of macular function in both eyes. The patient had no systemic symptoms. Results from the medical workup, which included chest radiography, Mantoux skin testing, and complete blood count, were unremarkable. Herpes viruses (simplex, varicella-zoster), Cytomegalovirus, Epstein-Barr virus, and human immunodeficiency virus serum titers were negative. Brain magnetic resonance imaging, abdominal ultrasound, and breast and gynecological examination results were also unremarkable. Treatment with 40 mg of prednisone daily was initiated 2 weeks after initial examination and tapered off during 6 months. The multifocal electroretinography appeared to improve in the left eye with therapy; however, bilateral visions, fields, and fundi appearances remained unchanged. No further deterioration was detected 18 months since halting treatment.