What is it?

Ischemic optic neuropathy (ION) refers to a condition which is characterized by a sudden loss of vision due to lack of blood flow to the optic nerve. It happens more commonly unilaterally, and may affect either the central or peripheral vision. Damage to the optic nerve cannot be fixed, thus causing permanent vision loss. ION may be a complication of temporal arteritis.

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Signs & symptoms

Symptoms may include sudden darkening of the vision.


Diagnosis is based upon findings from medical history and eye exam including swelling of the optic nerve. In some cases, blood tests may be performed.


There is no treatment for ION. If it is caused due to temporal arteritis, corticosteroids will be prescribed.

☝️ This is not a substitute for professional medical advice. Please consult with your physician before making any medical decision.

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