A 23-year-old man with a 2-day history of blurred vision on the right (visual acuity: 20/40 OD, 20/20 OS). A, The optic disc on the right side is elevated and hyperemic, with obscuration of the nerve fiber layer. B, 5 weeks after onset, funduscopic examination shows a macular star, characteristic of neuroretinitis. Optic disc edema is now less prominent.