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Anterior ischemic optic neuropathy
Neuro-Ophthalmology
Key Points
- •AION is the most common acute optic neuropathy over age 50; NAION accounts for ~90% and A-AION (GCA) for ~10%
- •NAION presents with painless sudden visual loss on waking, altitudinal field defect, and a 'disc at risk' in the fellow eye
- •A-AION is an ophthalmic emergency - start IV methylprednisolone 1 g/day immediately, BEFORE temporal artery biopsy results
- •IONDT proved optic nerve sheath decompression is NOT effective for NAION and may be harmful (JAMA 1995)
- •Jaw claudication (LR ~4.2) is the most specific historical symptom for GCA; ESR and CRP must be checked urgently in all patients >50 years with disc edema
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Keep reading Anterior ischemic optic neuropathy
17 more sections are included with the Clinical plan.
- Definition
- Epidemiology
- Aetiology and causes
- Pathogenesis
- Classification
- Risk factors and associations