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Non-arteritic: Indicates that the condition is not related to inflammation or damage of the arteries, which would be arteritic anterior ischemic optic neuropathy. Anterior : Refers to the front part of the optic nerve, which is located at the point where the optic nerve enters the eye ( optic disc ).
Non-arteritic AION is more common than AAION and usually occurs in slightly younger persons. While only a few cases of NAION result in near total loss of vision, most cases of AAION result in nearly complete vision loss. [citation needed] Nonarteritic anterior ischemic optic neuropathy is an isolated white-matter stroke of the optic nerve (ON).
Ischemic optic neuropathy (ION) is the loss of structure and function of a portion of the optic nerve due to obstruction of blood flow to the nerve (i.e. ischemia).Ischemic forms of optic neuropathy are typically classified as either anterior ischemic optic neuropathy or posterior ischemic optic neuropathy according to the part of the optic nerve that is affected.
Optic neuropathy is damage to the optic nerve from any cause. The optic nerve is a bundle of millions of fibers in the retina that sends visual signals to the brain. Damage and death of these nerve cells, or neurons, leads to characteri
PION is less common than Anterior Ischemic Optic Neuropathy (AION). [4] Blood supply and surrounding anatomy make the anterior and posterior portions of the optic nerve susceptible to different ischemic pressures. [citation needed] The posterior optic nerve receives blood primarily from the pial branches of the ophthalmic artery.
Arteritic anterior ischemic optic neuropathy (arteritic AION, A-AION or AAION) is vision loss that occurs in giant cell arteritis (also known as temporal arteritis).Temporal arteritis is an inflammatory disease of medium-sized blood vessels that happens especially with advancing age.
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CRAO can be classified based on it pathogenesis, as arteritic versus non-arteritic. [5] [1] [6] Non-arteritic CRAO is most commonly caused by an embolus and occlusion at the narrowest part of the carotid retinal artery due to plaques in the carotid artery resulting in carotid retinal artery atherosclerosis. [1] [5] [6] Further causes of non ...