Ocular Migraine: Symptoms, Causes and When It’s an Emergency

An ocular migraine usually means a migraine aura that affects your sight: shimmering zigzag lines, flashing lights or a blind spot that spreads and then fades, often within an hour. [4] [8] It is usually harmless, but changes in one eye only can be a sign of something more serious and need checking quickly. [8]

The name is confusing, because doctors don’t use it as a diagnosis. [5] [8] This guide explains the two things people mean by it, what the symptoms look like, what can trigger them, and when to get help.

What is an ocular migraine?

“Ocular migraine” is not in the International Classification of Headache Disorders (ICHD-3), the system doctors use to diagnose headaches. [5] People use the name for two different conditions: [8]

• Migraine with visual aura. This is what most people mean. The change in sight comes from the brain, so it affects both eyes. It usually isn’t serious. [8]
• Retinal migraine. This is very rare. The change in sight is in one eye only. [3] [8]

Most changes in sight that affect one eye are not retinal migraine. They can have other causes that need treatment, which is why one-eye symptoms should always be checked. [8]

How to tell if it is in one eye or both

A visual aura often feels like it is in one eye, because it fills one side of your vision. It actually comes from the back of the brain, so it shows up in both eyes. [5] People often get this wrong when they describe it afterwards. [1]

A simple check while the aura is happening: [5]

1. Look at something with words on it, like a book or your phone.
2. Cover your left eye with your hand. Is the aura still there?
3. Now cover your right eye instead. Is it still there?
4. If you can see it with either eye covered, it is in both eyes. This points to a visual aura.
5. If it goes away when you cover one particular eye, it is in that eye only. Get medical help straight away. [8]

If you can’t tell, or it is the first time, get it checked. Doctors advise seeing someone straight away for changes in sight that haven’t been looked at before. [8]

Ocular migraine symptoms

A visual aura often starts as a small zigzag shape near the centre of your vision. Over several minutes it slowly spreads to one side, with a shimmering edge, and can leave a blind spot behind it. [1] Common symptoms are: [1] [7] [8]

• zigzag lines
• flashing, shimmering or sparkling lights
• blind spots, or patches where you can’t see clearly
• dots or stars

Aura can also cause pins and needles that spread slowly through one side of the body or face, or trouble finding words. [1] [6] Weakness is not part of typical aura. [1] Treat weakness as an emergency, and numbness or speech problems too if they are new to you or different from your usual aura (see the signs below). [8] [9]

With a headache

For most people, a migraine headache follows the aura, usually within an hour. [1] [5] It is often throbbing and on one side of the head, with nausea and sensitivity to light and sound. [6] Our guide to migraine symptoms covers each phase of an attack.

Without a headache (silent migraine)

Some people get the aura with no headache. Doctors call this typical aura without headache, and it is also called silent migraine. [2] [11] Only about 4% of people with migraine have it. It is most common in young adults in their 20s and 30s, and in people aged 40 to 60. Some people find their headaches stop as they get older while the aura carries on. [5]

How long does an ocular migraine last?

Each aura symptom usually lasts 5 to 60 minutes. [1] The NHS says aura should not last longer than 1 hour, and aura that does needs an urgent appointment. [6]

If a headache follows, the whole migraine attack usually lasts 4 hours to 3 days. [6] You may feel tired or low for up to 2 days afterwards. [1]

A visual aura goes away completely. [1] Retinal migraine usually clears too, but permanent vision loss has been reported, which is another reason to get one-eye symptoms checked. [3] [4]

What triggers an ocular migraine?

It is not known exactly what causes migraine. [6] Visual aura is thought to come from a slow wave of electrical activity across the outer layer of the brain. [4]

Triggers are different for each person. Common ones are:

• too much or too little sleep [7]
• stress and tiredness [6] [7]
• hormonal changes, including your period [6] [7]
• skipping meals or not eating regularly [6] [7]
• bright or flashing lights, and long stretches looking at a screen [4] [7]
• too much caffeine or alcohol [6] [7]
• dehydration [4]

A trigger doesn’t cause an attack every time, so it helps to note what happened before each one. The NHS suggests keeping a migraine diary to work out your triggers. [6]

How is an ocular migraine diagnosed?

There is no single test. A doctor diagnoses migraine aura mainly from your description, plus a physical and neurological exam. [1] [7] You may also have an eye exam, including a check of your field of vision. [5]

Scans such as an MRI or CT aren’t usually needed for migraine. A doctor may order one, or blood tests, if something else could be causing your symptoms. [5] [7]

Doctors look harder for other causes when: [2] [3] [8]

• the change in sight is in one eye only
• aura without a headache starts for the first time after age 40
• the aura is very short or lasts longer than an hour
• you only lose sight, with no shimmering or zigzags

The main thing to rule out is a transient ischaemic attack (TIA, or mini-stroke). [2] Retinal migraine is only diagnosed once other causes of one-eye vision loss have been ruled out. [3]

What helps with an ocular migraine?

A visual aura usually passes on its own. While it lasts:

• Stop anything that needs clear sight, such as driving or reading, until your vision is back to normal. [8]
• Rest your eyes and take a break from screens. [4]
• Move away from bright sunlight or harsh lighting. [4]
• If a headache follows, lie down in a dark, quiet room. [6]

If you have migraine headaches, a GP or doctor can advise on medicines to treat attacks. Painkillers work best taken as soon as the headache starts. Try not to take them on more than 2 days a week, as this can cause more headaches. [6]

If attacks are frequent, ask a doctor about prevention. There are preventive medicines, and other options such as acupuncture and relaxation techniques. [6] [7] Regular sleep and wake times, regular meals, enough water and managing stress can also help. [6] [7]

What should you write down?

Aura is hard to describe afterwards, so headache doctors advise timing and recording it as it happens. [1] Write down:

• the time the aura started and the time it ended
• whether it was in one eye or both, using the cover-one-eye check
• what you saw, and whether it spread or moved
• any other symptoms, such as tingling or trouble speaking
• whether a headache followed, and how long after
• what came before it: sleep, stress, meals, screen time or your period
• any medicines you took, and whether they helped

A headache diary helps your doctor find patterns and the right treatment. [7] The free trigger tracker and symptom tracker work well for this, and our migraine page covers tracking attacks and aura.

You can also tell Juno by voice or text when an aura starts. Juno logs it and turns your notes into a dated summary for your doctor.

When is an ocular migraine an emergency?

Most visual auras are harmless. But sudden changes in sight can also come from a stroke or a detached retina, which need treatment fast. [8] [9] [10]

This article is for general information only and does not replace advice from your own clinician. Juno is a health assistant, not a medical provider.

Last updated 10 November 2026