MIGRAINE · VISUAL AURA
The shimmer is back. What helps?
A shimmering zigzag can leave you second-guessing your last meal, your screen, or a stressful day. Understand what visual aura is, what may bring it on, what helps you through it, and what migraine medicine can and can’t do.
Dr. Shailesh Male
Board-certified in neurology and vascular neurology. Practicing neurointerventionalist.
Adjunct Assistant Professor, Brody School of Medicine.
Key takeaways
- Visual aura can occur with a headache or on its own. Some suspected triggers may be early symptoms of an attack already starting.
- Comfort measures can help you through an episode. Feeling better and shortening the aura are different outcomes.
- Treating headache and stopping aura are different jobs. Bring repeated patterns and your treatment goals to your clinician.
For recurring aura that a clinician has already assessed. If symptoms are new or different, or include weakness, speech trouble or sudden vision loss, go straight to When to get help.
On this page
What the shimmer is
This kind of visual aura starts in the brain, not the eye. The leading explanation is a slow wave of changed activity moving across the visual part of the brain, at the back of the head. That's why it's usually seen in both eyes, even when it feels like one. It can come with a headache, or on its own. Each aura symptom usually lasts between five minutes and an hour, though some last longer.
Sometimes the attack gets there first
Hours before the shimmer, some people yawn more, feel worn out, get a stiff neck, find light too bright, or crave something sweet. This early stage is called the prodrome. So if light already felt harsh, the office lights got the blame. If you were already craving chocolate, the chocolate got the blame. Research suggests some suspected triggers may really be early symptoms like these. For any single episode, you often can't tell which it was.
Triggers are real, just not a switch
Think of a tide. Your brain's readiness for an attack rises and falls from day to day. A short night, a skipped lunch or the end of a hard week may push the tide higher. Bright light is a wave: at low tide it washes in harmlessly, and at high tide the same wave can come over the wall. That's why the same office lights can seem fine on Monday and suspicious on Friday.
So help keep the tide steady: regular sleep and meals, enough to drink, and an eye out for patterns that repeat. If something reliably comes before your aura and it's easy to avoid, avoiding it is reasonable. You don't need to blacklist every food or screen after one bad afternoon.
What helps you through it
First, make yourself safe. Stop driving or anything else that needs clear vision; if you're behind the wheel, pull over safely. Note when it began, and if your clinician has given you a plan, follow it.
Then do what helps you. If closing your eyes, dimming the room or sitting quietly makes an aura easier to ride out, that counts. Feeling more comfortable is a real benefit, even though it's different from making the shimmer end sooner. A typical aura fades on its own, so when it clears after something you tried, it may have been on its way out anyway. That doesn't mean the fix did nothing; one good afternoon just can't settle the question.
Products sold as aura-stoppers are a different category. None is established to reliably end an aura, and "natural" isn't the same as "safe for you." Check with your clinician or pharmacist before you rely on one.
What migraine medicine can and can't do
Treating the headache and stopping the aura are two different jobs. Migraine medicines such as triptans treat the headache. When a sumatriptan injection was tested during the aura itself, in one placebo-controlled trial, the aura didn't end significantly sooner than with placebo. If you've been prescribed an acute headache medicine, ask your prescriber exactly when to take it.
If your auras are frequent or getting in the way of your life, preventive treatment is worth a conversation. Most of that research measures migraine or headache days, and the evidence for reducing aura itself is thinner. Tell your clinician what you most want help with: the shimmer, the headache, or both.
Bring useful notes
- On ordinary days, including days without aura: sleep, meals, fluids, stress and, if it applies, your menstrual cycle.
- During an episode: when it started, whether it built up gradually or hit all at once, what you saw, which part of your vision, how it spread, when it fully cleared, and whether a headache followed.
- Anything you took or tried, when, and what felt better.
When to get help
Having had aura before does not rule out a stroke.
Call 911 or your local emergency number for sudden loss of vision, vision that doesn't fully come back, new weakness or numbness, a drooping face, new trouble speaking, sudden confusion or loss of balance, or a sudden, severe headache. Don't drive yourself. If those symptoms go away, still get emergency help. Stroke warning signs can disappear quickly and still matter.
Get assessed urgently if it's your first aura, if it's clearly different from your usual pattern, or if it lasts much longer than usual. If it's happening right now and you're not sure what it means, treat it as an emergency.
If your familiar auras are simply becoming more frequent or more disruptive, book a routine review.
A plan you can use
Make yourself safe. Do what helps you ride it out. Help keep the tide steady. Write down what happened, and take your notes, and your real goal, to your clinician. If you smoke or use estrogen-containing birth control, make sure your clinician knows you get aura. Migraine with aura is linked to a higher risk of ischemic stroke, and that can change which options make sense for you.
Your questions, answered
Can you have a visual aura without a headache?
Yes. Visual aura can occur with a headache or on its own. A first or changed episode still needs assessment.
Is it my eye? Someone called it an "ocular migraine."
That label alone does not establish what is causing your symptoms. The kind of visual aura described here starts in the brain and is usually seen in both eyes. For sudden loss of vision in one or both eyes, call 911 or your local emergency number.
How can I tell an aura from a stroke?
You can't safely tell them apart at home, and having had aura before doesn't rule out a stroke. Use the When to get help guidance above, and if you're unsure while it's happening, treat it as an emergency.
I'm over 60 and just had my first aura. What should I do?
Get assessed urgently. A first episode later in life needs evaluation for other causes, including a transient ischemic attack (TIA). If symptoms are happening now and you're unsure what they mean, treat it as an emergency.
Does feeling better mean a comfort measure stopped my aura?
Feeling more comfortable is a real benefit. It is different from showing that the aura ended sooner. Because aura can fade on its own, one episode cannot settle how much a comfort measure changed its duration.
Should I take medicine when the aura starts?
Treating the headache and stopping the aura are different jobs. If you've been prescribed an acute headache medicine, ask your prescriber exactly when to take it.
Can I drive during an aura?
No. Stop driving or anything else that needs clear vision. If you're behind the wheel, pull over safely.
Selected sources
- ICHD-3. 1.2 Migraine with aura (aura features and per-symptom duration)
- ICHD-3. Typical aura without headache (including evaluation of first episodes later in life)
- American Headache Society. Types of Aura (usually seen in both eyes because it comes from the brain)
- Karsan N et al. Are some patient-perceived migraine triggers simply early manifestations of the attack? J Neurol 2021;268:1885–1893
- Bates D et al. Subcutaneous sumatriptan during the migraine aura. Neurology 1994;44:1587–1592
- Puledda F et al. IHS global practice recommendations for the acute pharmacological treatment of migraine. Cephalalgia 2024;44(8)
- Schürks M et al. Migraine and cardiovascular disease: systematic review and meta-analysis. BMJ 2009;339:b3914
- American Stroke Association. Transient ischemic attack (TIA)