An autoimmune process characterized by the clinical triad of ophthalmoplegia, ataxia, and areflexia. The disease is Monarch Disease Ontology id MONDO_0005851 (Miller Fisher syndrome). Also known as: Fisher syndrome, Fisher's syndrome, Guillain Barre syndrome, Miller Fisher variant, Guillain-Barre syndrome, Miller Fisher variant, Miller Fisher variant of Guillain Barre syndrome, Miller-Fisher syndrome, Miller-Fisher variant of Guillain-Barre syndrome, cranial variant of GBS.