Optic neuritis is classified as an ophthalmological or neurological disorder, caused by demyelination of the central nervous system. Diagnosis of this condition is crucial, and the following tests are recommended: Firstly, visual evoked potentials should be performed. This test can clearly show the corresponding lesions in the optic nerve. Secondly, magnetic resonance imaging (MRI) of the optic nerve is needed. MRI can reveal changes in the optic nerve, such as thickening and edema. Thirdly, some blood tests related to bleeding should be conducted. Specifically, testing for aquaporin-4 antibodies to determine if it is neuromyelitis optica. Additionally, a lumbar puncture is also necessary. This primarily aims to check for demyelination markers, such as oligoclonal bands. Once optic neuritis is diagnosed, timely treatment is required, mainly using corticosteroids or intravenous immunoglobulin.