Visual Aura

Visual aura often has a characteristic pattern: zigzags, shimmer, heat-wave distortion, flashing edges, or a blind spot that slowly spreads. It most often occurs with migraine, with or without headache. The gradual spread is important; sudden visual loss behaves differently and needs a different evaluation.

What Visual Aura Looks Like

Visual aura is the most common type of migraine aura, and it tends to have a signature rhythm.

Classic migraine visual aura features:

Positive phenomena (seeing something):

• Scintillating scotoma-flickering, shimmering arc
• Fortification spectra-zigzag lines like castle walls
• Photopsia-flashing lights
• Kaleidoscope effects
• Sparkling or glittering dots
• Heat wave or shimmer effect

Negative phenomena (losing vision):

• Scotoma-blind spot that may expand (different from vision loss from optic nerve disease)
• Hemianopia-loss of half the visual field (similar to stroke but temporary)

Characteristic features:

• Starts small and expands outward over minutes
• Affects both eyes (homonymous-same side in each eye)
• Lasts 20-60 minutes typically
• May be followed by headache, nausea, light sensitivity (photophobia)
• Can occur without headache ("acephalgic migraine")

Timeline of Typical Migraine Aura

1. Onset: Small visual disturbance begins, often near center of vision
2. Spread: Expands gradually over 5-20 minutes
3. Duration: Total aura lasts 20-60 minutes
4. Resolution: Visual symptoms fade
5. Headache phase: May follow within 60 minutes (or may not occur)

Migraine Aura vs. Other Visual Phenomena

When Visual Phenomena Are NOT Migraine

Other Causes of Visual Phenomena

Eye Causes

Posterior vitreous detachment

• Flashes in peripheral vision
• New floaters
• One eye
• Usually older adults

Retinal tear/detachment

• Flashes of light
• Curtain or shadow over vision
• One eye
• Emergency

Neurological Causes

TIA (transient ischemic attack)

• Sudden onset
• May have other neurological symptoms
• Stroke risk factors present

Occipital seizure

• Brief (seconds to minutes)
• Stereotyped (same each time)
• May have other seizure features

Other

Visual snow syndrome

• Persistent "static" in vision
• Different from migraine aura
• See visual snow syndrome

Entoptic phenomena

• Normal visual phenomena (floaters, blue field entoptic)
• Not pathological

When to Seek Care

How Visual Aura Is Diagnosed

Diagnosis is usually clinical, meaning the description of the episode is central:

Detailed History

• Exact description of what you see
• How long it lasts
• Whether it spreads or expands
• Timing relative to headache
• Frequency of episodes
• Any associated symptoms

Examination

• Complete eye exam (usually normal)
• Neurological exam (usually normal)
• Visual field testing if indicated

Testing (if atypical features)

• MRI brain-to rule out structural causes
• Visual field testing-to document any field loss
• OCT-if optic nerve involvement suspected
• EEG-if seizures suspected
• Cardiac evaluation-if stroke risk factors present

Treatment of Migraine with Aura

During Aura

• Find a quiet, dark place if possible
• Avoid driving until aura resolves
• Take acute migraine medication if appropriate
• Some people find caffeine helpful

Prevention (if frequent)

• Migraine preventive medications-various options
• Lifestyle modifications-regular sleep, meals, exercise
• Trigger identification and avoidance
• Magnesium supplementation-may help some people

Special Considerations

• Estrogen-containing contraceptives-generally avoided in migraine with aura due to stroke risk
• Triptans-generally safe to use, but not during aura phase
• Cardiovascular risk-slightly increased in migraine with aura; manage risk factors

Frequently Asked Questions

Is migraine aura dangerous?

Typical migraine aura itself is not dangerous in the moment, though it can be scary and disabling. Migraine with aura is linked to a slightly higher long-term vascular risk, so smoking, blood pressure, cholesterol, and estrogen-containing contraception deserve real attention.

Can I drive during an aura?

No. Visual aura can erase or distort enough of the scene to make driving unsafe. If it starts while driving, pull over safely and wait until it completely resolves.

Why do I get aura without headache?

This is called "acephalgic migraine" or "silent migraine." The aura is the same phenomenon; the headache phase simply doesn't follow. This is common and generally follows the same patterns as migraine with headache.

Should I go to the ER for migraine aura?

Not usually, if you have a history of similar auras. However, seek emergency care for your first ever aura, aura with unusual features, aura lasting more than 60 minutes, or any neurological symptoms like weakness or speech difficulty.

Can aura happen in both eyes?

Yes-in fact, this is typical. Migraine aura usually affects the same half of the visual field in both eyes (homonymous). This is because the disturbance is in the brain, not the eyes. If you cover one eye and the aura goes away, it may not be typical migraine.

Do children get visual aura?

Yes, children can have migraine with visual aura, though their descriptions may be different. Alice in Wonderland syndrome (distorted body image, size perception) is a migraine variant more common in children.

References