Management of Non-Arteritic Ischemic Optic Neuropathy (NAION)

Diagnostic Priorities

The American College of Physicians recommends ruling out giant cell arteritis first, as this is the critical differential diagnosis that requires immediate high-dose corticosteroids to prevent bilateral blindness, and obtaining ESR and CRP immediately in any patient over 50 with acute vision loss and optic disc changes 1
The American Academy of Ophthalmology suggests asking specifically about jaw claudication, scalp tenderness, and new-onset headache, and if GCA is suspected based on clinical features, initiate prednisone 40-60 mg daily immediately—do not wait for laboratory confirmation 1
Temporal artery biopsy can be performed up to 2 weeks after starting corticosteroids without affecting diagnostic yield, according to the American College of Rheumatology 1

The American Geriatrics Society recommends screening all NAION patients for OSA using clinical history and polysomnography, and initiating CPAP therapy when AHI ≥15/hr, or AHI ≥5/hr with significant symptoms or cardiovascular comorbidities 2, 3
The American Diabetes Association suggests targeting HbA1c 6-7% to prevent microvascular complications affecting optic nerve perfusion 4

The American Academy of Ophthalmology recommends regular ophthalmologic follow-up to monitor for fellow eye involvement, and ongoing assessment of systemic risk factors with primary care coordination, particularly for patients with both hypertension and diabetes 1, 4