Flashing Lights in Eyes: Is It Migraine Aura or an Eye Problem?

By Laurine NicolettiOctober 20, 202612 min

You're reading, or scrolling, or just waiting for the bus, and a small shimmering spot appears in the middle of your vision. Then it grows into a glittering zigzag arc, and a patch of the world goes missing. It's strange, it's a little scary, and the first question is usually the same: are these flashing lights in my eyes a migraine, or is something wrong with my eyes?

Seeing flashing lights in your eyes with a migraine is very common, and in most cases it's a visual aura: a temporary signal from the brain, not from the eye. But a few features point somewhere else and deserve a quick check. This article walks you through what a typical aura looks like, how it behaves over time, and which signs mean you should get an eye exam or urgent help. It's part of our guide to migraine symptoms.

In short

A typical visual aura builds gradually over about 5 minutes, affects both eyes, and usually fades within an hour, according to the NHS and Mayo Clinic.
Sudden new flashes, a shower of floaters, or a dark curtain across your vision can point to a problem in the eye itself, such as a detached retina, and need urgent assessment.
Vision loss with weakness, trouble speaking, or a sudden, extremely painful headache is an emergency, not an aura to wait out (NHS).
Describing exactly what you see, how long it lasts and whether it's in one eye or both helps your doctor far more than the words "flashing lights."

What does a typical visual aura look like?

A typical visual aura is a moving, shimmering disturbance that affects both eyes and slowly spreads across your field of vision. Mayo Clinic lists blind spots, zigzag lines that float across your vision, shimmering spots or stars, and flashes of light as common visual symptoms of migraine with aura.

Many people describe the same picture: a small bright spot that expands into a C-shaped or curved line with jagged edges, a bit like the walls of an old fort. Doctors even call this pattern a fortification spectrum for that reason. Inside the arc, vision can look blurred, or there may be a blind spot (a scotoma).

A systematic review of the clinical features of visual aura found that a shimmering blind spot (scintillating scotoma) was the most common type, followed by zigzag lines, blurred vision and tunnel vision. So if your aura doesn't look exactly like the textbook drawing, that's normal. Auras come in many shapes.

One more clue: visual aura shows up in both eyes, according to the American Migraine Foundation, because it comes from the brain's visual areas and not from one eye. A rough way to think about it is that the disturbance stays there when you cover one eye. It's not a test and it doesn't replace a medical opinion, but it's a useful thing to notice and to tell your doctor.

Not everyone with migraine gets aura. The American Migraine Foundation says it affects around 25 to 30% of people with migraine, and that about 90% of those who have aura experience visual symptoms. If you want the full picture of the pattern, see our guide to migraine with aura, and our simple map of the types of migraine.

How long does an aura last, and what comes next?

Most auras last between 5 and 60 minutes. The NHS says aura symptoms typically develop over about 5 minutes and shouldn't last longer than an hour, and Cleveland Clinic gives the same 5 to 60 minute range for most episodes.

The slow build is a key feature. A typical aura starts small, grows, moves, then fades, often leaving your vision completely back to normal. Flashes that appear and are gone within a second or two, or symptoms that hit at full strength with no build-up, don't follow that script.

After the aura, a headache often follows within about an hour, but not always. Some people get the aura and no head pain at all, which is called silent migraine. And the headache phase has its own timeline, which we cover in how long a migraine lasts.

Why does your brain show you things that aren't there?

Cleveland Clinic explains that a migraine aura is thought to come from a wave of electrical activity called cortical spreading depression. Brain cells in the outer layer of the brain become overactive, then go quiet, in a wave that travels across the cortex. That slow wave is why the zigzag seems to travel and why the whole thing builds gradually.

The eye itself is usually perfectly healthy during this. The "picture" is being produced in the brain, which is why an aura can look so real. For more on what's going on behind a migraine attack, see what causes migraines.

"Ophthalmic migraine," ocular migraine, retinal migraine: what's what?

These terms are used loosely, and they don't all mean the same thing. When people say "ophthalmic migraine" or "ocular migraine," they usually mean the ordinary visual aura described above, which comes from the brain and affects both eyes. We unpack the wording in our guide to ophthalmic migraine.

Retinal migraine is different and much rarer. The NHS describes it as partial or total vision loss in one eye, usually lasting 10 to 20 minutes before vision gradually returns, with the same eye affected almost every time. The American Migraine Foundation separates it from typical aura precisely because it involves one eye only.

The NHS says these episodes can be frightening but are usually harmless and short-lived. Still, because other conditions can look similar, the NHS advises asking for an urgent GP appointment or contacting NHS 111 if you have a vision problem such as a blind spot for the first time. In the US, a call to your doctor or an eye doctor is a sensible first step. A professional has to confirm which one you're dealing with, and that can't be done from home.

Which flashes of light should send you to an eye doctor?

Flashes that are sudden, new, and linked to floaters or a shadow in your vision deserve a same-day eye check. Photopsia is the medical word for seeing flashes of light that aren't coming from the outside world, and not all of it comes from migraine.

The NHS lists the warning signs of a detached retina:

floaters (dots or lines) that suddenly appear or suddenly increase in number
flashes of light in your vision
a dark curtain or shadow moving across your vision
vision that suddenly becomes blurred

If you get these, the NHS says to get help from NHS 111 straight away. In the US, Cleveland Clinic advises going to your eye doctor or the emergency room right away, because untreated retinal detachment can lead to permanent vision loss.

So how do you tell the difference in practice? These features lean toward the eye and away from migraine aura:

the flashes or floaters are new and come on suddenly, with no slow build
you notice them in one eye only
there's a shadow or curtain that stays, rather than a shimmering arc that moves and fades
you've never had migraine, or your usual aura has changed

None of this means something is wrong. It means a trained person should look. Eye doctors can examine the back of your eye in minutes, and most of the time the news is reassuring.

When is a vision problem an emergency?

Treat vision changes as an emergency when they come with weakness, numbness, trouble speaking, confusion, or a sudden, extremely painful headache. The NHS stroke guidance lists blurred vision or loss of sight in one or both eyes alongside a drooping face, arm weakness and slurred speech, and says to call 999 (911 in the US).

Mayo Clinic adds that if you have new signs of migraine with aura, such as temporary vision loss, speech or language difficulty, or muscle weakness on one side of your body, you should see a doctor immediately so more serious conditions like stroke can be ruled out. A sudden, severe "worst ever" headache is also a reason to get help fast (NHS).

Here are the situations where you shouldn't wait it out:

your aura lasts longer than one hour (the NHS says to seek an urgent GP appointment or call NHS 111 in that case)
numbness, weakness or speech trouble appears, especially if it's new or stronger than your usual aura (Cleveland Clinic)
you suddenly lose vision in one or both eyes
the symptoms come on abruptly instead of building up

Cleveland Clinic also stresses not to wait for symptoms to settle: if they clear up after a few minutes, you should still get checked. Our article on when to go to the ER for a migraine goes through the red flags in more detail.

One more thing worth knowing, calmly. The NHS notes that people with migraine have around twice the risk of an ischaemic stroke compared with people without migraine, though the risk for any one person remains small. The NHS also says women with migraine with aura are generally advised not to use the combined contraceptive pill. If that applies to you, it's a good topic for your doctor, and you can read more in birth control and migraine.

What should you write down to describe your flashes and zigzags?

Write down what you saw, how it moved, how long it lasted and whether it was in one eye or both. A clear description is often the most useful tool a doctor has, because they can't see your aura themselves. Doing this in the moment is much easier than remembering later.

These details are worth noting:

The shape: zigzag, shimmering arc, dots, stars, straight flashes, a dark patch
The movement: did it stay still, grow, or drift from the centre to the side?
Which eye: was it still there when you covered each eye in turn?
The timing: when it started, how long it took to build, when it ended
What came with it: tingling, speech trouble, dizziness, nausea or a headache afterwards
The context: poor sleep, stress, screens, your cycle, a skipped meal

Over a few weeks, these notes turn into a pattern that you and your doctor can read. For a full checklist, see what to write down in a migraine diary.

What can you do during an aura you already know?

If you already know your aura and it follows its usual pattern, the practical goal is to stay safe and notice what happens. Your vision can be unreliable for up to an hour, so it makes sense to stop what you're doing, especially driving, cycling, or climbing stairs, and sit somewhere comfortable until it passes.

Some people find that a quiet, dim place helps them feel calmer while the aura runs its course. Time how long it lasts, and note whether it matches your usual pattern or feels different. Anything new, longer or more intense than usual is a reason to call a healthcare professional.

If you're wondering about medicines to take at the first sign of an aura, that's a conversation for your doctor, who knows your history. You can also read about non-drug approaches in how to relieve a migraine without medication.

Conclusion: what you see matters, so write it down

Flashing lights, zigzags and blind spots that build slowly, affect both eyes and fade within an hour are the classic signature of a migraine aura. Sudden flashes with new floaters, a dark curtain, a symptom in just one eye, or anything that comes with weakness or trouble speaking are different, and they deserve fast medical attention.

You don't have to figure it out alone. If you're ever unsure, getting checked is never wasted, and a short description in your own words (what, where, how long) makes that appointment far more useful. Be gentle with yourself: an aura is unsettling, but for most people with migraine it's a temporary, familiar visitor.

Frequently asked questions

Can you get flashing lights in your eyes with a migraine but no headache?

Yes. Some people have a visual aura with no headache afterwards, often called silent migraine. Cleveland Clinic describes it as typical aura without headache. If it's the first time, or the symptoms are new, it's worth having a doctor check it.

Is a migraine aura dangerous for my eyes?

A typical visual aura comes from the brain rather than the eye, and it normally fades without damage. The NHS says that even retinal migraine, the rarer one-eye form, is usually harmless and short-lived. Any vision loss that doesn't recover, or that appears suddenly, needs prompt medical attention.

How can I tell migraine aura from a detached retina?

Aura typically builds gradually over about 5 minutes, affects both eyes, and fades within an hour (NHS). A detached retina is more likely to bring sudden flashes, a sudden rise in floaters, or a dark curtain or shadow in your vision (NHS). Only an examination can tell for sure, so get new or unusual symptoms checked urgently.

Should I see a doctor if I get a visual aura for the first time?

Yes, it's sensible. The NHS advises asking for an urgent GP appointment or contacting NHS 111 for vision problems such as a blind spot for the first time, and Mayo Clinic recommends seeing a doctor promptly for new aura symptoms. Most of the time the answer is reassuring, but it's best to rule out other causes.

Sources

Written by Laurine Nicoletti, founder of Mellow, who has lived with migraine since she was 21. Learn more · How we write our articles

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