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In contrast, NAION results from the coincidence of cardiovascular risk factors in a patient with "crowded" optic discs. 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.
Non-arteritic anterior ischemic optic neuropathy (NAION) is a medical condition characterized by loss of vision caused by damage to the optic nerve as a result of ischemia, or insufficient blood supply. The key symptom of NAION is optic disc swelling, which typically resolves within 2 months, but often leads to optic atrophy. The likelihood of ...
Most cases of AAION result in nearly complete vision loss first to one eye. If the temporal arteritis is left untreated, the affected eye will likely suffer vision loss as well within 1–2 weeks. Arteritic AION (AAION) falls under the general category of anterior ischemic optic neuropathy (AION), which also includes non-arteritic AION (NAION ...
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.
NAION presents as a painless loss of vision, often when awakening, that occurs over hours to days. Most patients lose the lower half of their visual field (an inferior altitudinal loss), though superior altitudinal loss is also common. The pathophysiology of NAION is unknown, but it is related to poor circulation in the optic nerve head.
Looking inside the person's eyes at the time of onset, ophthalmoscope exam reveals no visible changes to the optic nerve head.Weeks after ischemic insult, nerve atrophy originating from the damaged posterior optic nerve progresses to involve the anterior optic nerve head.
Diabetic papillopathy has many characteristics similar to Non-arteritic anterior ischemic optic neuropathy (NAION). [5] Diabetic papillopathy is simultaneously bilateral and unlike AION, optic nerve function is not impaired in diabetic papillopathy. [6]
Pain, visual loss, relapse, and steroid response are typical of CRION. [1] [3] Ocular pain is typical, although there are some cases with no reported pain. [3]Bilateral severe visual loss (simultaneous or sequential) usually occurs, but there are reports of unilateral visual loss. [3]