A, Fundus photograph showing disc appearance of a 42-year-old woman who presented 3 weeks after noticing inferior shadows OD. Visual acuity was 20/20, but visual field testing (B) demonstrated an inferior arcuate visual field defect. The patient’s medical history was remarkable for transfusion 18 months prior, with evidence of subsequent Pneumocystis jiroveci pneumonia. She was found to be HIV-seropositive, and a diagnosis of CMV optic neuritis was made