BACKGROUND AND OBJECTIVES: Optic neuritis (ON) is a common manifestation of multiple sclerosis (MS), aquaporin-4-IgG seropositive neuromyelitis optica spectrum disorder (AQP4+NMOSD), and myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD). Compared with MS-ON, AQP4-ON and MOGAD-ON eyes exhibit more severe thinning of the macular composite ganglion cell + inner plexiform layer (GCIPL), as measured by optical coherence tomography (OCT). The individual measurement of the ganglio...