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Here is a quick mnemonic “OPTIC NEUROPATHY to remember about Anterior Ischemic Optic Neuropathy

This can be valuable for patients as well as medical doctors, nurses & students doing their clinical rounds. You can also find it very useful for med exams like USMLE, MBBS, NEET PG, FMGE, NExT, MCAT & NCLEX exams

Anterior Ischemic Optic Neuropathy : How To Remember Easily ?

  • O – Optic disc edematous and bordered by nerve fiber layer splinter hemorrhages.
  • P – Painless monocular visual loss that is sudden in onset.
  • T – Two forms: arteritic and nonarteritic.
  • I – Insufficient blood flow through posterior ciliary arteries.
  • C – Crowded disc architecture and small optic cup predispose to nonarteritic AION.
  • N – No specific cause known, but diabetes, renal failure, and hypertension are risk factors.
  • E – Erectile dysfunction drugs have doubtful causal association with AION.
  • U – Unilateral AION increases likelihood of the same event in the other eye.
  • R – Risk factors: diabetes, renal failure, hypertension.
  • O – Optic disc-at-risk increases likelihood of nonarteritic AION.
  • P – Polymyalgia rheumatica symptoms may be present.
  • A – Arteritic AION associated with giant cell arteritis.
  • T – Temporal artery biopsy mandatory for suspected arteritic AION.
  • H – High doses of glucocorticoids needed to prevent blindness in second eye.
  • Y – Yield sufficient tissue sections in temporal artery biopsy.


Dr. Arin Nandi

Passionate About Medical Science & Helping Future Doctors Achieve Top Ranks In Medical Exams. He is professionally a dentist as well as a public health expert from JIPMER working in department