Approach to the diagnosis of nonarteritic anterior ischemic optic neuropathy (NAION)

CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; GCA: giant cell arteritis; MRI: magnetic resonance imaging.

* New headache, jaw claudication, fever, or other constitutional symptoms or signs.

¶ Refer to UpToDate topics on GCA and optic neuropathies.

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