optic neuritis medcation causes
1 Optic neuritis is an inflammation of the optic nerve, often affecting young adults in one eye. 2  Optic neuritis is frequently associated with multiple sclerosis. 3  Other causes include infections, autoimmune disease, and injury to the optic nerve. The symptoms of optic neuritis include vision loss, reduced color vision, and pain on movement of the eye with recovery over weeks to a month, in most cases. 2  The diagnosis is made on the basis of the patient history and an examination by an ophthalmologist.