Anterior<unk>  presents with sudden, painless visual loss developing over hours to days.
Ischemic optic neuropathy
Posterior ischemic optic neuropathy
Anterior ischemic optic neuropathy
Optic neuritis
Arteritic anterior ischemic optic neuropathy
Autoimmune optic neuropathy
Ocular ischemic syndrome
Toxic and nutritional optic neuropathy