Migraine and the Eye

Migraine & Ocular Link - Eye Ache Echoes

• Migraine, a common neurological disorder, frequently manifests with ocular symptoms.
• Visual Aura (most common precursor/accompaniment):
  • Scintillating scotomas (flickering blind spots).
  • Fortification spectra (teichopsia/zigzag lines).
• Ocular discomfort:
  • Photophobia (light sensitivity) is a hallmark.
  • Eye ache/pain: often unilateral, retro-orbital, throbbing.
• Pathophysiology: Involves trigeminovascular system activation and cortical spreading depression (CSD).

⭐ Retinal migraine features fully reversible, monocular positive or negative visual phenomena (scintillations, scotoma, or blindness) lasting minutes to <1 hour, differentiating it from typical aura with binocular involvement.

Visual Aura Pathophysiology - Brain's Light Show

• Cortical Spreading Depression (CSD): The primary mechanism.
  • Wave of neuronal/glial depolarization.
  • Starts in occipital lobe (visual cortex).
  • Spreads across cortex at ~3-5 mm/min.
  • Followed by prolonged neuronal suppression.
• Neurochemical Events:
  • Massive efflux of $K^+$ ions, influx of $Ca^{2+}$.
  • Release of glutamate, CGRP, NO.
  • Cerebral blood flow: initial brief hyperemia, then sustained oligemia.
• Clinical Correlation:
  • CSD in visual cortex → scintillating scotomas, fortification spectra.
  • Activates trigeminovascular system → headache.

⭐ The slow propagation rate of Cortical Spreading Depression (~3-5 mm/min) across the occipital cortex directly correlates with the gradual build-up and spread of visual aura symptoms.

Key Migraine Eye Syndromes - Vision's Vexing Variants

• Retinal Migraine
  • Monocular, reversible visual disturbance (loss, scintillations, scotoma).
  • Headache follows/accompanies.
  • Diagnosis of exclusion.
• Migraine with Aura (Visual)
  • Binocular, homonymous (fortification spectra, scintillating scotoma).
  • Develops ≥5 min; lasts 5-60 min.
  • Headache usually follows.
• Persistent Visual Aura (PVA)
  • Aura >1 week; no infarction.
  • Continuous/frequent positive (photopsia) or negative (scotoma) phenomena.
• Recurrent Painful Ophthalmoplegic Neuropathy (RPON)
  • (Formerly Ophthalmoplegic Migraine)
  • Headache + ipsilateral ocular CN palsy (III most common, IV, VI).
  • Childhood onset; MRI essential.

  ⭐ RPON: CN III palsy can involve pupil, unlike diabetic CN III (pupil-sparing).

• Acephalgic Migraine (Aura without Headache)
  • Typical aura (visual, sensory, speech); no headache.
  • Commoner in elderly; R/O TIA.

Diagnosis & Mimics - Sorting Sight Signals

• Migraine with Visual Aura:
  • IHS Criteria: ≥2 attacks; reversible visual symptoms (scintillating scotoma, photopsia).
  • Key features: Gradual spread (≥5 min), duration 5-60 min, headache follows within 60 min.
• Retinal Migraine: Monocular, transient, reversible visual disturbance; headache association.
• Critical Mimics:
  • TIA/Stroke: Sudden, negative phenomena, vascular risks.
  • Retinal Detachment: Floaters, flashes, curtain.
  • Occipital Seizure: Brief, stereotyped, coloured.
• ⚠️ Red Flags: New onset >50 yrs, thunderclap headache, persistent deficit, aura >60 min, papilledema.

⭐ Aura symptoms lasting longer than 60 minutes (persistent aura) or including motor weakness are red flags requiring urgent neuroimaging to exclude stroke.

High‑Yield Points - ⚡ Biggest Takeaways

• Migraine with aura is strongly associated with visual symptoms, often preceding the headache phase.
• Visual auras, like scintillating scotomas or fortification spectra, typically last 5-60 minutes.
• Acephalgic migraine (migraine aura without headache) is a recognized variant.
• Retinal migraine is characterized by monocular visual disturbances, distinct from typical binocular aura.
• Ophthalmoplegic migraine (recurrent painful ophthalmoplegic neuropathy) involves CN palsies; CN III is most common.
• Crucial to differentiate from TIA and other emergent neurological conditions.