Figure 3. Two days after starting treatment with oral corticosteroids, there is reduced vascular sheathing. A chorioretinal infiltrate is now visible inferior to the preexisting scar. Visual acuity was 3/200 OD. Treatment with a 6-week course of 50 mg of pyrimethamine daily and 1 g of sulfadiazine daily was begun. The dosage of oral prednisone was tapered over 3 weeks.