“…Poor visual outcome was reported in 2 patients with neuromyelitis optica who developed ocular infections (toxoplasmosis and cytomegalovirus retinitis) while they were on immunosuppressants and the dose was increased because they were thought to have a relapse of their optic neuritis. 4 Another case series reported 2 patients with no history of demyelinating disease who were diagnosed with ARN due to VZV after they were initially thought to have inflammatory optic neuritis and treated with steroids. 5 One of these patients experienced permanent vision loss.…”