Autoimmune optic neuritis, such as optic neuritis associated with neuromyelitis optica spectrum disorders (NMOSD) and anti‒myelin oligodendrocyte glycoprotein antibody (MOG-Ab) ‒associated disorders (MOGAD), is often refractory to treatment and relapses frequently; hence long-term treatment to prevent relapse is important [1]. Here, MOG is linked to optic neuritis.