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    Ocular Migraine

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    Ocular migraines cause vision loss, disturbances, or blindness lasting less than an hour, along with or following a migraine headache. Experts sometimes call these episodes "retinal," "ophthalmic," or "monocular" (meaning one eye) migraines.

    This problem is rare. It affects about one out of every 200 people who have migraines. Some research suggests that in many cases, symptoms of ocular migraine are actually due to other problems.

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    Diagnosing ocular migraine requires a health care professional to rule out other conditions that can cause similar symptoms. Being able to describe the symptoms properly is important for helping your doctor determine whether you actually have an ocular migraine.

    Ocular Migraine Symptoms

    According to the International Headache Society's definition of this condition -- which it calls retinal migraine -- symptoms include:

    Vision problems that affect one eye. These problems include:

    • Flashing lights
    • Blind spots in your field of vision
    • Blindness in the eye

    Vision loss can be a complication of retinal migraines.

    Headache that lasts from four to 72 hours. The headache tends to:

    • Affect one side of your head
    • Feel moderately or very painful
    • Pulsate in intensity
    • Feel worse when you're physically active

    Other symptoms include:

    An important symptom is that the vision loss only affects one eye. Many people have trouble identifying the difference between flashing lights or blindness in one side of their vision -- but involving both eyes -- versus having these symptoms in only one eye.

    A regular migraine with an aura, which can involve flashing lights and blind spots in the vision, is a more common problem. This type affects about 20% of people who have migraines. But in these cases, these symptoms usually appear in one side of your field of vision and in both eyes.

    Covering one eye and then the other can help you tell if your problem is affecting one eye or both.

    Ocular Migraine Causes

    Experts aren't sure what causes ocular migraines. Some feel that the problem is related to:

    • Spasms in blood vessels in the retina, the delicate lining in the back of the eye
    • Changes that spread across the nerve cells in the retina

    People who have these migraines may have a higher risk of developing permanent vision loss in one eye. Experts don't know if preventive treatments for migraines -- such as tricyclic antidepressants or anti-seizuremedications -- can help prevent permanent vision loss. However, it's wise to talk to your doctor about your symptoms.

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