Ophthalmic migraine: visual aura and when to seek help
An ophthalmic migraine refers to a migraine accompanied by a visual aura: bright zigzag lines or a shimmering spot that spreads, then fades away. It is a transient neurological phenomenon, and most often a harmless one, that originates in the brain’s visual cortex rather than in the eye. The aura typically lasts around thirty minutes and clears without any lasting effect. It affects the field of vision of both eyes at once. Certain signs, however, call for seeing an ophthalmologist the same day or, failing that, going to an eye emergency department: a disturbance limited to a single eye or a first aura after age 50; an associated neurological deficit, for its part, calls for calling 15.
THE ESSENTIALS
What is an ophthalmic migraine?
In everyday language, an ophthalmic migraine refers to a migraine accompanied by a visual aura. It is a transient, harmless neurological phenomenon that shows up as temporary visual disturbances, sometimes preceding or accompanying a headache. Migraine with aura is one of the best-characterised forms of this common neurological condition Lucas 2021.
The term can be misleading. We speak of an “ophthalmic” aura, but the disturbance does not come from the eye itself. It arises in the visual cortex, an area of the brain located at the back of the skull, in the occipital lobe. This is where visual information is processed. A passing wave of electrical activity, known as cortical spreading depression, is thought to produce these unusual images there before fading away Charles 2013.
In practical terms, the visual aura typically lasts around thirty minutes, and most often less than an hour Viana 2016. It then disappears completely, leaving no lasting effect. It is sometimes followed by a headache, often on just one side of the head, but not always. Some people experience auras without any headache at all: this is called an isolated aura.
Visual aura affects a substantial proportion of people with migraine. In a population-based study conducted in Korea (Kim, 2022), 29.4% of people with migraine described a visual aura; among those who have migraine with aura, the aura is visual in 98% of cases.
It is important to tell this phenomenon apart from other visual disturbances. Flashes or spots of light can also arise from the retina, the sensitive membrane at the back of the eye. These phosphenes of retinal origin do not carry the same meaning. To locate these structures, our page on the anatomy of the eye and the one dedicated to the retina offer helpful context.
RECOGNISING THE AURA
The visual aura: what does it look like?
The typical visual aura is a scintillating scotoma: a bright patch that appears in the centre of the field of vision, then slowly spreads towards the periphery. This disturbance affects both eyes at once, because it originates in the brain and not in a single eye. Flashes of bright light, blurred or “foggy” vision, zigzag lines and scotoma (a blind spot) are the most commonly reported features Viana 2019.
Descriptions vary from one person to another, but certain signs come up again and again. Many describe bright zigzag lines, likened to the ramparts of a fortress. Others report flashes of light, shimmering spots or a blurred zone that hides part of the vision. Here are the most frequently reported features.
- A bright spot that gradually enlarges at the centre of the gaze;
- Zigzag lines, shimmering, often with coloured edges;
- A blind spot, or dark patch, in part of the visual field;
- A sense of wavy vision, as if seen through heated glass;
- A gradual build-up over a few minutes, then a complete disappearance.
One detail helps a great deal in recognising the migraine aura: its moving, evolving nature. The disturbance shifts, grows and changes shape over the minutes, then fades. This progression sets it apart from a fixed spot or a sudden veil, which point to other causes. A disturbance that stays identical and still deserves a different look.
After the aura, a headache may arise, often throbbing and on one side only. It is sometimes accompanied by nausea, discomfort with light or with noise. But the aura can also remain isolated. If your disturbances are limited to flashes without the typical picture of a scotoma, our page on phosphenes may help you sort things out.
How a visual aura unfolds
What sets the aura apart is its movement: it appears, grows, then fades.
The onset
A small bright spot or a blurred area appears near the centre of your gaze.
The spread, over a few minutes
A shimmering zigzag arc grows and moves towards the periphery.
The end, most often in less than an hour
The disturbance leaves the field of vision and disappears without after-effects.
Then, sometimes
A headache, often on one side only. It may also be absent.
An aura that lasts more than an hour or affects only one eye should be examined the same day.
DIFFERENTIAL DIAGNOSIS
Ophthalmic migraine, retinal migraine or stroke: how to tell them apart?
An ophthalmic migraine affects both eyes, whereas a retinal migraine, far rarer, affects a single eye. A stroke, for its part, comes on suddenly and is often accompanied by other neurological signs. Telling these situations apart is essential, because they differ in seriousness and in how they are managed. The following pointers help distinguish them.
- Ophthalmic migraine (aura): originates in the brain’s visual cortex. Affects the same visual field in both eyes. Gradual build-up over a few minutes, lasting around 30 min. Appearance: scintillating scotoma, zigzags. Headache and nausea possible afterwards;
- Retinal migraine (rare): originates in the retina of a single eye. Loss or reduction of vision, shimmering or a dark zone limited to that eye. Closing the other eye, the disturbance persists; closing the affected eye, it disappears. Its monocular nature warrants seeing an ophthalmologist the same day or, failing that, going to an eye emergency department;
- Vascular warning signs (TIA/stroke): sudden, immediate onset. Loss of vision, but above all associated signs: difficulty speaking, weakness of an arm, numbness on one side of the face. Faced with these signs, do not wait and call 15.
The classic ophthalmic migraine
This is the most common and most reassuring form. The aura arises in the visual cortex and involves the field of vision of both eyes. A simple test helps you realise this: closing one eye and then the other, the disturbance remains present on both sides. This feature clearly sets it apart from a problem confined to a single eye.
The closed-eye test
During the disturbance, closing one eye and then the other helps tell where it comes from.
Teaching diagram. This test gives a pointer; it does not replace an examination.
The retinal migraine
Much rarer, it shows up as a visual disturbance affecting a single eye. It may be a shimmering, a dark zone or a reduction in vision, limited to that eye. Closing the other eye, the disturbance persists; closing the affected eye, it disappears. This monocular character warrants seeing an ophthalmologist the same day or, failing that, going to an eye emergency department, to rule out a vascular cause.
A 2024 review (Grosberg) describes retinal migraine as a loss of vision in one eye, fully reversible, lasting less than an hour, mainly in young women who already have migraine with aura. It notes that nearly half of the reported cases with repeated episodes were subsequently left with permanent loss of vision in that eye: one more reason never to dismiss a visual disturbance affecting a single eye.
The signs of a vascular problem
A transient ischaemic attack or a stroke can mimic certain visual disturbances. What should raise the alarm is the sudden onset, the persistence of the deficit and, above all, the association with other signs: difficulty speaking, weakness of an arm, numbness on one side of the face. Faced with these symptoms, you must not wait and should call 15 without delay.
Migraine with aura is associated with a higher risk of ischaemic stroke: a meta-analysis of 14 studies (Etminan, 2005) estimated it at 2.27 times that of people without migraine, even though this risk remains low in absolute terms in a young person. It increases with contraceptives containing oestrogens: a 2021 review (Lucas) points out that they markedly increase the risk of stroke in women with migraine with aura. Migraine with aura should therefore always be reported to the doctor who prescribes contraception. To put this risk in perspective, in an American study of 203,853 users of combined hormonal contraception (Batur, 2023), a stroke occurred in 0.06% of them.
CAUSES AND TRIGGERS
What are the causes and triggering factors?
An ophthalmic migraine is attributed to a wave of electrical activity that crosses the visual cortex, known as cortical spreading depression. The role of this mechanism is supported by numerous studies, even though some uncertainties remain Charles 2013; migraine with aura, moreover, carries a more pronounced hereditary component than migraine without aura Charles 2018. Certain triggering factors are well identified and come up regularly in the accounts of those affected.
These triggers are not the same for everyone. Each person often has their own factors, which they learn to spot over time. Keeping a diary of attacks helps identify what, in your case, precedes the episodes. Here are the factors most often reported in the context of migraine.
- Stress, or conversely the wind-down phase after a tense period;
- Lack of sleep, or an irregular sleep pattern;
- Prolonged screen exposure and eye strain;
- Certain foods or drinks, depending on each person’s sensitivity;
- Hormonal changes, particularly around the menstrual cycle;
- Bright, flickering light, or strong contrasts of light.
One point deserves clarifying. Eye strain or time spent in front of a screen can favour an attack in a predisposed person, but they do not cause the migraine on their own. The mechanism remains neurological. Correcting an uncompensated visual defect, on the other hand, removes a source of discomfort and can reduce certain indirect triggers.
THE OPHTHALMOLOGIST’S ROLE
What is the ophthalmologist’s role?
The ophthalmologist’s role is first of all to rule out an ocular cause for the visual disturbances. Examining the back of the eye makes it possible to check the state of the retina and the vitreous, and to rule out a local origin for the flashes or spots. Once this cause is ruled out, the migraine falls to neurological management.
Why is this step important? Because certain visual disturbances resemble an aura without being one. A detachment of the vitreous or the retina can cause flashes of light and moving spots. Examining the back of the eye, carried out after dilating the pupil, makes it possible to tell the difference and not to miss a retinal problem.
Depending on the case, the ophthalmologist may add a visual field test to analyse the extent and location of a disturbance. They also check the optical correction and look for an uncompensated visual defect. These checks do not treat the migraine, but they rule out local causes and remove any factors of visual discomfort.
The long-term management of migraine, for its part, falls to the general practitioner or the neurologist. They are the ones who assess how often the attacks occur, propose a suitable acute treatment and, if needed, a preventive treatment. The ophthalmologist and these doctors work in a complementary way, each in their own field. This sharing of roles ensures a complete assessment.
WARNING SIGNS
When should you seek urgent help?
Most visual auras are harmless, but certain signs call for seeking advice without delay. A visual disturbance that drags on, a late first aura (in common practice, after age 50) or an associated neurological deficit should never be dismissed. These situations call for ruling out a vascular cause without delay Lucas 2021.
A late first aura is not exceptional. In the American Framingham cohort (Wijman, 1998), 1.23% of the people surveyed described migraine-like visual disturbances, which had begun after age 50 in 77% of cases and were never accompanied by headache in 58% of cases. A 2015 review (Vongvaivanich) stresses that these late auras without headache can mimic a transient ischaemic attack: a first episode after age 50 therefore warrants an assessment to rule out a vascular cause.
If any of these signs are present, see an ophthalmologist the same day or, failing that, go to an eye emergency department; call 15 if this is accompanied by a neurological deficit or a sudden, unusual headache:
- an aura that lasts more than an hour, or a visual disturbance that persists;
- a very first visual aura occurring after age 50;
- symptoms that always affect the same eye;
- an aura without headache in an older person or someone at vascular risk;
- an associated neurological deficit: speech disturbance, weakness of a limb, numbness on one side;
- a sudden, intense and unusual headache, described as the worst ever felt.
These signals do not necessarily mean there is a serious problem, but they warrant a careful examination, the same day. A strictly monocular disturbance, in particular, should always be assessed. If your flashes are accompanied by light halos or other unusual visual phenomena, it is better to seek help than to wait it out. When in doubt, get advice.
RELIEF AND PREVENTION
How can you relieve and prevent attacks?
Relief rests first on simple measures during the attack and on preventing triggers. In common practice, identifying and limiting your own triggering factors is one of the measures suggested to space out migraine episodes. A regular lifestyle plays a central role, alongside any treatment decided with a doctor.
During the aura, the most helpful thing to do is often to stop. Many people find relief by settling in a quiet, dark place, away from light and noise. It is better to avoid driving while the visual disturbance lasts. Here are the prevention measures most often recommended day to day.
- Keep regular sleep hours, without excess or lack;
- Manage stress with breaks, gentle physical activity or relaxation;
- Take regular breaks from screens to rest the eyes;
- Stay well hydrated and avoid skipping meals;
- Keep a diary of attacks to spot your personal triggers;
- Have your visual correction checked in case of persistent discomfort.
Ophthalmic migraine in figures
Three benchmarks from large studies.
These figures describe populations, not an individual case.
When attacks become frequent or disabling, you should not face them alone. A doctor can propose an acute treatment, to take at the first signs, and sometimes a preventive treatment to space out the episodes. Repeated self-medication, particularly with painkillers, is not advised without medical advice, as it can keep the headaches going.
FREQUENTLY ASKED QUESTIONS
Frequently asked questions
Is an ophthalmic migraine dangerous?
In its usual form, the visual aura is a harmless, transient neurological phenomenon that disappears without any lasting effect, most often in under an hour. It damages neither the eye nor the vision. Some situations, however, call for seeing an ophthalmologist the same day or, failing that, going to an eye emergency department, such as a first aura after age 50 or a visual disturbance that persists. When in doubt, seek help.
How long does an ophthalmic migraine last?
The visual aura typically lasts around thirty minutes, and most often less than an hour. It builds up gradually, then fades completely. A headache may follow afterwards, but not always. A visual disturbance that drags on beyond an hour or that persists should prompt you to see an ophthalmologist the same day or, failing that, go to an eye emergency department, to rule out another cause.
Does an ophthalmic migraine come from the eye or the brain?
It comes from the brain, not the eye. The aura arises in the visual cortex, located at the back of the skull, in the occipital lobe. That is why the disturbance affects the visual field of both eyes at once. A disturbance limited to a single eye points to another cause and warrants seeing an ophthalmologist the same day or, failing that, going to an eye emergency department.
Can you have a visual aura without a headache?
Yes, it is possible. This is called an isolated aura, or aura without headache. The visual disturbances appear then disappear without being followed by a headache. In a young person with no risk factor, this often remains harmless. In an older person or someone at vascular risk, you should see an ophthalmologist the same day or, failing that, go to an eye emergency department.
Should you see an ophthalmologist or a neurologist?
Both can be involved in a complementary way. The ophthalmologist examines the back of the eye to rule out an ocular cause for the visual disturbances. The long-term management of migraine, for its part, falls to the general practitioner or the neurologist. Faced with an unexplained visual disturbance, an ophthalmic examination is a useful step.
Do screens cause ophthalmic migraine?
Screens and eye strain can favour an attack in a predisposed person, but they do not cause the migraine on their own. The mechanism remains neurological. Taking regular breaks, resting the eyes and having your visual correction checked can reduce certain factors of discomfort and limit indirect triggers.
How can you tell an ophthalmic migraine from a stroke?
The migraine aura builds up gradually, over a few minutes, and disappears most often in under an hour. A stroke comes on suddenly and is often accompanied by other signs: difficulty speaking, weakness of an arm, numbness on one side of the face. Faced with these signs, you must not wait and should call 15 without delay.
Scientific sources
- Viana M, Tronvik EA, Do TP, Zecca C, et al. Clinical features of visual migraine aura: a systematic review. J Headache Pain. 2019;20(1):64. PMID 31146673
- Charles A. The Migraine Aura. Continuum (Minneap Minn). 2018;24(4):1009-1022. PMID 30074546
- Charles AC, Baca SM. Cortical spreading depression and migraine. Nat Rev Neurol. 2013;9(11):637-644. PMID 24042483
- Lucas C. Migraine with aura. Rev Neurol (Paris). 2021;177(7):779-784. PMID 34384631
- Viana M, Linde M, Sances G, Ghiotto N, et al. Migraine aura symptoms: Duration, succession and temporal relationship to headache. Cephalalgia. 2016;36(5):413-421. PMID 26156076
- Kim KM, et al. Prevalence and impact of visual aura in migraine and probable migraine: a population study. Sci Rep. 2022. PMID 35013446
- Grosberg BM, et al. Retinal migraine. Handb Clin Neurol. 2024. PMID 38307658
- Etminan M, et al. Risk of ischaemic stroke in people with migraine: systematic review and meta-analysis of observational studies. BMJ. 2005. PMID 15596418
- Batur P, et al. Use of combined hormonal contraception and stroke: A case-control study of the impact of migraine type and estrogen dose on ischemic stroke risk. Headache. 2023. PMID 36752588
- Wijman CA, et al. Migrainous visual accompaniments are not rare in late life: the Framingham Study. Stroke. 1998. PMID 9707189
- Vongvaivanich K, et al. Late-life migraine accompaniments: A narrative review. Cephalalgia. 2015. PMID 25505036
Further reading
- Phosphenes: flashes and spots of light in the visual field
- Light halos around lights: causes and when to seek help
- Anatomy of the eye: understanding how your vision works
Consultations in Cachan, Paris 13 and at the Sorbonne Saint-Michel practice (Paris 5th) · Tel. +33 1 45 47 08 11
Medical disclaimer
This article is for informational purposes and is not a substitute for a medical consultation. An unusual, prolonged visual disturbance, one limited to a single eye or associated with other neurological signs, requires medical advice. In the event of a sudden or worrying visual symptom, see an ophthalmologist the same day or, failing that, go to an eye emergency department, and call 15 if this is accompanied by a neurological sign.
Written and reviewed by Dr Moïse Tourabaly, ophthalmic refractive surgeon — former chef de clinique (Quinze-Vingts National Eye Hospital).
Last updated: October 4, 2026
