Neuromyelitis optica is a disorder of the central nervous system in which the eye nerves and spinal cord are primarily affected. The disease is previously known as Devic’s disease and is now recognized as neuromyelitis optica spectrum disorder in broader terms.
NMO takes place when the immune system attacks the cells in the central nervous system. Primarily, the spinal cord and optic nerves suffer the attack, but in more severe cases, the brain is also affected.