Devic's disease is an inflammatory condition that affects the protective covering of spinal cord and optic nerves. Due to the part of the nerve affected by the condition, NMO is classified as a demyelinating disease. The two types of Devic's disease, or neuromyelitis optica (NMO.
Neuromyelitis optica spectrum disorders (NMOSD, previously and "Evaluation and diagnosis of multiple sclerosis in adults", section on.
Neuromyelitis optica (NMO) and NMO Spectrum Disorder (NMOSD), also NMO can occur at any age — in children as young as 3 and adults as old as 90.