<unk> , is a rare defect of the optic<unk>  that causes moderate to severe visual field defects.<unk>  of the optic<unk>  is a congenital anomaly of the optic disc in which there is a defect of the inferior aspect of the optic<unk> . The issue stems from incomplete closure of the embryonic fissure while in utero. A varying amount of glial tissue typically fills the defect, manifests as a white mass.
Coloboma of optic nerve
Posterior ischemic optic neuropathy
Arteritic anterior ischemic optic neuropathy
Ischemic optic neuropathy
Autoimmune optic neuropathy
Anterior ischemic optic neuropathy
Optic nerve tumor
Chronic relapsing inflammatory optic neuropathy