When most people think of migraine, they think of a severe headache. But migraine is a neurological condition, and symptoms can begin before the headache—or occur without one altogether.

One fascinating symptom is migraine aura, which can cause flashing lights, zig-zag patterns, blind spots or shimmering vision. It typically develops gradually and lasts between five and 60 minutes. Visual aura generally affects both eyes because it originates in the brain’s visual processing areas.

I’ve experienced visual aura following concussion, while my wife Nicole has lived with migraine for years. It’s something we understand both professionally and personally.

But where do the eyes fit in?

Think of your visual system like a backpack. You can carry a certain weight comfortably, but add a few extra rocks and you’ll fatigue sooner.

Small amounts of long-sightedness (hyperopia), astigmatism or binocular vision imbalance can make your visual system work harder to maintain comfortable vision. For people susceptible to migraine, reducing unnecessary visual demand may help manage their overall trigger load.

A comprehensive eye examination can identify prescription issues or assess how your eyes work together. For selected patients, prism lenses, appropriate tints or light-filtering options may improve visual comfort.

These approaches don’t cure migraine, but they may help reduce unnecessary visual strain.

Migraine history is also relevant when assessing glaucoma risk. Research has associated migraine with normal-tension glaucoma, where optic nerve damage can occur despite normal eye pressure. Vascular factors, including low blood pressure and Raynaud’s phenomenon, may also be relevant.

Importantly, never assume every visual disturbance is migraine. New, sudden, one-sided or persistent vision changes need prompt assessment.

Your eyes are part of a complex neurological system. Sometimes, the goal isn’t simply to see more clearly, but to see more comfortably, with less unnecessary load.

Frequently Asked Questions About Migraine and Your Eyes

1. What is migraine aura, and how long does it last?

Migraine aura is a temporary neurological symptom that can affect your vision. You might notice flashing lights, zig-zag patterns, shimmering areas or blind spots. Visual aura usually develops gradually and lasts between five and 60 minutes, often resolving completely. It generally affects the visual field of both eyes because the disturbance originates in the brain rather than in one eye. However, new or unusual visual symptoms should not automatically be assumed to be migraine.

2. Can your glasses prescription contribute to eye strain or headaches?

Yes, an uncorrected prescription can contribute to visual discomfort for some people. Long-sightedness (hyperopia), astigmatism and certain focusing or eye-coordination difficulties can make your visual system work harder to maintain comfortable vision. Correcting these issues may reduce visual strain, although it does not necessarily prevent migraine attacks. A comprehensive eye examination can help determine whether your prescription or the way your eyes work together could be contributing to your symptoms.

3. Can an eye examination help if I experience migraine?

An eye examination can help identify visual factors that may be contributing to discomfort and assess your overall eye health. This may include checking your prescription, how your eyes focus and work together, and the health of your retina and optic nerves. For selected patients, prism lenses, appropriate tints or light-filtering options may improve visual comfort. These approaches are not a cure for migraine, which is a complex neurological condition, but addressing relevant visual issues may help some people.

4. Is there a link between migraine and glaucoma?

Research has found an association between migraine and glaucoma, particularly normal-tension glaucoma. This is a form of glaucoma in which the optic nerve can be damaged even when eye pressure is within the traditionally normal range. Factors affecting blood flow, including low blood pressure and Raynaud’s phenomenon, may also be relevant when assessing risk. Having migraine does not mean you will develop glaucoma. Your optometrist can consider your medical history alongside your eye pressure, optic nerve appearance and other risk factors when determining appropriate monitoring.

5. When should visual disturbances be assessed urgently?

Seek urgent medical assessment for sudden or significant changes in vision, especially if symptoms affect only one eye, persist or differ from your usual migraine aura. A sudden shower of new floaters, flashes or a curtain-like shadow can indicate a retinal problem and needs urgent assessment. Vision loss accompanied by weakness, difficulty speaking, facial drooping or other new neurological symptoms requires emergency medical attention. Although typical migraine aura develops gradually and resolves within five to 60 minutes, it is important not to assume that every visual disturbance is migraine.