A 32-year-old woman has sudden painful loss of vision in he…
A 32-year-old woman has sudden painful loss of vision in her right eye. She comes to your office the next day, and a neuro-ophthalmologic examination documents 20/60 vision in the right eye, with a depressed monocular visual field. In the left eye, vision is 20/20 and the visual field is normal. Funduscopic examination shows optic disc pallor and an afferent pupillary defect of the right eye; the left eye is normal. Which of the following is the most likely diagnosis?