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Nonarteritic anterior ischemic optic neuropathy is an isolated white-matter stroke of the optic nerve (ON). NAION is the most common cause of sudden optic nerve-related vision loss, affecting more than 10,000 Americans every year, often bilaterally.
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.
The name non-arteritic anterior ischemic optic neuropathy is derived from several medical terms that describe the condition: [3]. Non-arteritic: Indicates that the condition is not related to inflammation or damage of the arteries, which would be arteritic anterior ischemic optic neuropathy.
Non-arteritic anterior ischemic optic neuropathy, or NAION, is a condition that affects the optic nerve, a bundle of fibers that connects to the back of the eye and carries signals to the brain so ...
Ischemic optic neuropathies are classified based on the location of the damage and the cause of reduced blood flow if known. [3] Anterior ischemic optic neuropathy (AION) includes diseases that affect the optic nerve head and cause swelling of the optic disc. These diseases often cause sudden rapid visual loss in one eye.
The condition, nonarteritic anterior ischemic optic neuropathy, occurs when the blood supply to the optic nerve, which carries visual signals from your retina to your brain and allows you to see ...
The anterior optic nerve receives blood primarily from the posterior ciliary arteries. The anterior optic nerve, a.k.a. the optic nerve head, is surrounded by the scleral canal, and is vulnerable to crowding of nerve fibers. The portion of the optic nerve head that is visible by looking into the eye with an ophthalmoscope is called the optic disc.
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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