Canadian Medical Guide > Diseases > Nervous System Diseases > Cranial Nerve Diseases > Optic Nerve Diseases > Optic Neuropathy, Ischemic Terms and Definitions

Optic Neuropathy, Ischemic

Medical Definition:	Ischemic injury to the optic nerve which usually affects the optic disk (optic neuropathy, anterior ischemic) and less frequently the retrobulbar portion of the nerve (optic neuropathy, posterior ischemic). The injury results from occlusion of arterial blood supply which may result from TEMPORAL ARTERITIS; ATHEROSCLEROSIS; COLLAGEN DISEASES; EMBOLI; DIABETES MELLITUS; and other conditions. The disease primarily occurs in the sixth decade or later and presents with the sudden onset of painless and usually severe monocular visual loss. Anterior ischemic optic neuropathy also features optic disk edema with microhemorrhages. The optic disk appears normal in posterior ischemic optic neuropathy. (Glaser, Neuro-Ophthalmology, 2nd ed, p135)
Also Called:	Anterior Ischemic Optic Neuropathy,Posterior Ischemic Optic Neuropathy
Previously Indexed:	Optic Nerve (1966-1975),Optic Nerve Diseases (1976-1995)

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