A retinal migraine is a rare type of migraine that causes temporary vision loss or visual disturbances in one eye only. Unlike the more common migraine with aura, which affects both eyes because it originates in the brain, a retinal migraine involves the blood vessels at the back of one eye narrowing suddenly and restricting blood flow to the retina. The visual symptoms typically last 10 to 20 minutes, though they can persist for up to an hour, and vision gradually returns to normal afterward.
How a Retinal Migraine Affects Your Eye
In a typical migraine with aura, abnormal electrical signals fire across the surface of the brain, producing visual disturbances that appear in both eyes simultaneously. A retinal migraine works differently. The disruption happens locally, in the blood vessels that supply the retina of one eye. These vessels go into spasm, temporarily choking off blood flow to the light-sensitive tissue at the back of the eye.
This vasospasm is what produces the hallmark one-eye-only vision loss. You might see flickering lights, a growing blind spot (called a scotoma), or a complete but temporary blackout of vision in that eye. The process also appears to involve the release of signaling molecules that modulate the retinal arteries, contributing to the constriction and the visual symptoms that follow.
What It Feels Like
The visual symptoms of a retinal migraine can include shimmering or scintillating lights, a dark spot that gradually expands across your field of vision, or total blindness in the affected eye. These changes spread gradually over five minutes or more, rather than appearing all at once. Most episodes resolve within 10 to 20 minutes, though some last up to an hour.
A headache usually follows the visual symptoms within 60 minutes, but not always. Some people with retinal migraines never develop head pain at all, which can make the condition confusing and harder to identify. When a headache does occur, it tends to be on the same side as the affected eye and feels like a typical migraine: throbbing, moderate to severe, and sometimes accompanied by nausea or light sensitivity.
Retinal Migraine vs. Migraine With Aura
The single most important distinction is which eyes are affected. A migraine with aura causes visual changes in both eyes because the electrical disturbance is happening in the brain’s visual cortex. A retinal migraine affects only one eye because the problem is in the eye itself. If you close one eye during an episode and the visual disturbance disappears, it was likely affecting both eyes (a standard aura). If it persists in one eye regardless of which eye you close, that points toward a retinal migraine.
There are other differences worth knowing. Migraine with aura leads to a headache in more than 95% of cases, while retinal migraine has a weaker connection to head pain. Auras can also produce symptoms beyond vision changes, including numbness or tingling in the face or limbs, difficulty speaking, dizziness, and ringing in the ears. Retinal migraines are limited to visual symptoms in one eye. The vision disruptions from a retinal migraine also tend to be more severe than a typical aura, sometimes involving complete temporary blindness in the affected eye rather than the shimmering zigzag lines most aura sufferers describe.
What Triggers an Episode
Retinal migraines share many of the same triggers as other migraine types. Common culprits include stress, sleep deprivation, dehydration, skipping meals, and hormonal changes (particularly around menstruation). Bright or flickering lights, excessive caffeine or caffeine withdrawal, and intense physical exertion can also set off an episode. Some people find that their episodes cluster around specific patterns, like periods of high stress followed by sudden relaxation.
Keeping a symptom diary that tracks what you ate, how you slept, your stress levels, and your menstrual cycle (if applicable) can help you and your doctor identify your personal triggers. Avoiding those triggers is typically the first line of defense.
Conditions That Look Similar
Temporary vision loss in one eye is not always a retinal migraine. The same symptom, called amaurosis fugax, can be caused by a range of conditions, some of them serious. Carotid artery disease, where plaque in the neck arteries sends small clots toward the eye, is one of the most important to rule out because it signals a risk of stroke. Giant cell arteritis, an inflammatory condition of the blood vessels that is more common in people over 50, can also cause sudden monocular vision loss and requires urgent treatment to prevent permanent damage.
Other possibilities include retinal vein occlusion, optic nerve compression, and papilledema (swelling of the optic nerve from increased pressure inside the skull). Because the list of causes ranges from benign to life-threatening, a first episode of vision loss in one eye warrants a thorough medical evaluation. Diagnosis of retinal migraine requires that all of these other causes have been excluded first.
How It’s Diagnosed
There is no single test for retinal migraine. Diagnosis follows the criteria set by the International Headache Society, which require that you’ve had at least two attacks involving fully reversible visual symptoms in one eye only, that the symptoms spread gradually over at least five minutes and last between 5 and 60 minutes, and that a headache accompanies or follows the visual symptoms within an hour. The one-eye nature of the symptoms needs to be confirmed, ideally during an attack, either through a visual field examination or by having you draw exactly what you see in each eye.
Critically, the diagnosis can only be made after other causes of temporary monocular vision loss have been ruled out. This typically involves imaging of the carotid arteries, blood tests to check for inflammation, and a detailed eye examination. If you’re over 50 or have cardiovascular risk factors, the workup tends to be more extensive.
Treatment and Prevention
During an acute episode, there isn’t much to do beyond resting in a quiet, dimly lit space and waiting for the symptoms to pass. Most episodes resolve on their own within 20 minutes. If you’re driving or operating machinery when visual symptoms begin, stop immediately and wait for your vision to fully return.
For people who experience frequent retinal migraines, preventive treatment aims to reduce how often episodes occur. Medications that relax blood vessels, particularly calcium channel blockers, are sometimes prescribed because of the vasospasm component of the condition. However, the evidence supporting these medications for migraine prevention is mixed. In clinical trials, some calcium channel blockers performed only slightly better than a placebo, and side effects like constipation, low blood pressure, and fatigue lead some people to discontinue them. Your doctor may also consider beta-blockers or other standard migraine preventives depending on your overall health profile.
Lifestyle modifications often play the biggest role. Consistent sleep schedules, regular meals, adequate hydration, stress management, and avoiding your identified triggers can meaningfully reduce attack frequency for many people.
Risk of Permanent Vision Loss
The vast majority of retinal migraine episodes resolve completely, with vision returning to normal within an hour. However, repeated episodes of vasospasm carry a small risk of lasting damage to the retina. In rare cases, prolonged or severe constriction of the retinal blood vessels can lead to retinal infarction, where a portion of the retinal tissue is permanently damaged from lack of blood flow. This is uncommon, but it’s the reason neurologists and ophthalmologists take retinal migraines seriously and recommend preventive treatment when attacks are frequent.
If an episode lasts significantly longer than an hour, or if your vision does not fully return to normal after the visual symptoms fade, that warrants urgent medical attention. The same applies to a first-ever episode of vision loss in one eye, sudden vision loss accompanied by weakness or difficulty speaking, or any episode that feels markedly different from your usual pattern.