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What Is Ischemic Optic Neuropathy (AION/NAION)?

Ischemic optic neuropathy occurs when the optic nerve loses blood supply, leading to sudden vision loss. Arteritic AION is linked to inflammation of blood vessels, while non-arteritic AION involves poor circulation without inflammation. People often notice dim or blurred vision in one eye on waking. Exams show optic nerve swelling in early stages. Early recognition is important to protect the other eye.

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What Is Ischemic Optic Neuropathy (AION/NAION)?

Ischemic optic neuropathy occurs when the optic nerve loses blood supply, leading to sudden vision loss. Arteritic AION is linked to inflammation of blood vessels, while non-arteritic AION involves poor circulation without inflammation. People often notice dim or blurred vision in one eye on waking. Exams show optic nerve swelling in early stages. Early recognition is important to protect the other eye.

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What Causes AION/NAION?

Arteritic AION is usually linked to giant cell arteritis, which inflames blood vessels. Non-arteritic AION commonly appears in people with crowded optic nerves and vascular risk factors. Low nighttime blood pressure can also contribute. Diabetes and sleep apnea increase risk. Identifying the cause guides treatment.

Symptoms of AION/NAION

People notice sudden dimming or a dark patch in one eye. Color vision weakens. Some describe a hazy or shadowed view. Headache and scalp tenderness point toward arteritic AION. Symptoms usually appear without pain.

How Is AION/NAION Diagnosed?

Doctors examine the optic nerve for swelling or pallor. Blood tests check for inflammation in suspected arteritic AION. Imaging may help rule out other causes. Visual field testing shows characteristic defects. Diagnosis guides urgent treatment in arteritic cases.

How Is AION/NAION Treated?

Arteritic AION requires immediate corticosteroid therapy. Non-arteritic cases focus on managing vascular risks. Sleep apnea treatment and blood pressure adjustments may help. Vision recovery varies widely. Follow-up protects the fellow eye.

Frequently Asked Questions About AION/NAION

Is this an emergency?

Yes, arteritic AION requires immediate treatment.

Can vision recover?

Some improvement occurs in selected cases.

Is the other eye at risk?

Yes, especially in arteritic AION.

When should I seek care?

Seek care for sudden dimming vision in one eye.