Abstract
Optic neuritis (ON) is a rare complication of tumor necrosis factor (TNF)-α inhibitors. The autoantibody serostatus, treatment, and outcome of TNF-α inhibitor-associated ON remain unclear. We herein report a 50-year-old woman with ON following adalimumab therapy. The patient presented with decreasing visual acuity of the right eye, quickly diminishing to light perception. Anti-aquaporin-4 (anti-AQP4) and anti-myelin oligodendrocyte glycoprotein antibodies were negative. Adalimumab was discontinued, and intravenous methylprednisolone and intravenous immunoglobulin (IVIg) were administered. However, her visual acuity improved only up to counting fingers. IVIg may be ineffective depending on the pretreatment severity.