by Anna Hart
To many people, a migraine headache is a migraine headache. They assume, falsely, that all migraines are pretty much the same. So when one of the 15% of our population that suffers from migraine says they have an ocular migraine, non-sufferers may raise a skeptical eyebrow. The truth is, however, that there are many different kinds of migraine.
Define Ocular Migraine
An ocular migraine is a type of migraine that focuses on that part of the aura in which visual symptoms predominate. There may never be an actual headache.
Symptoms of Ocular Migraine
If you are familiar with regular migraine pain, and now hear of ocular migraine, you may very well ask, "How do I know if I have an ocular migraine? I have no headache."
An ocular migraine is sometimes called a migraine without headache. It is a migraine that distorts images when you look at them. The distortion usually begins in the image's center, and then moves to one side. Ocular migraine is likely to affect only one eye at a time. As an ocular migraine progresses, images may turn grey or wavy. You may even lose your sight temporarily.
Doctors differ in their understanding of ocular migraine. Some say that ocular migraine is more likely to occur as you get older. Others say it is typically seen in young adults. It can be quite frightening, as you may think you are losing your sight forever.
Physicians differ, too, in their understanding of ocular migraine symptoms. Some use the term to explain visual disturbances of aura without headache. Other use it to refer to one-sided blind spots in the field of vision, or blindness, that lasts less than an hour and is associated with a headache.
Do you have ocular migraine? With or without a headache, if you have the visual disturbances of an aura in only one eye, yours may be an ocular migraine.
Specific Symptoms of Ocular Migraine:
How do I know if I have an ocular migraine? I will have one or more of the following specific symptoms. See if any of these is true of you.
1. Holes in your field of vision - places where there is nothing. Perhaps you are looking at a flower, and the center of the flower is missing. Or you are watching television, and you can see the outside of the screen, but cannot see the center of the picture. When you close the unaffected eye, you can see that portion of the screen. The affected eye, however, has a blind spot.
2. When looking through the affected eye, you see everything as though hidden behind a shade of gray. It is as though you were watching television and someone slipped a piece of thin gray cloth over the screen.
3. Another test for ocular migraine is to see if the affected eye sees things as though looking through a window with rain streaming down over it. The watery glass effect will be limited to one eye.
Ocular Migraine Symptoms Are Temporary
Although you may feel, during an optical migraine episode, that you will never see clearly again, the symptoms are temporary and will not cause lasting damage to your eye.
While they are present, however, ocular migraine symptoms will interfere with daily activities such as reading and driving.
Why Ocular Migraine Is Not Just Another Migraine Aura
Ocular migraine and migraine with aura are very similar, and some people have difficulty distinguishing between the two. The source of the visual disturbances is the key. If it is migraine with aura, the source of visual trouble is the brain's occipital cortex. If it is ocular migraine, the source is the eye's retinal blood vessels.
Test Your Suspected Ocular Migraine
A relatively good test for ocular migraine is to cover or close one eye. If the symptoms remain, cover or close the opposite eye. If the symptoms stop, you probably have an ocular migraine. If the symptoms do not stop, but affect both eyes, you are probably experiencing traditional migraine aura.
CAUTION: Although yours may be ocular migraine, it may be something else. You are urged to seek advice from your physician. You will want to rule out serious eye disease, or a blood vessel disorder in vessels near the eye.
©2007, Anna Hart. Migraines are a part of Anna Harts family history, and although she personally does not suffer ocular migraine, Anna can sympathize with those who do. For that reason, she has turned her teaching and speaking skills to informing others about migraines. She posts regular migraine-oriented articles at http://www.migrainereliefblog.com If this article on ocular migraine has been helpful to you, Anna invites you to read about ophthalmic migraine in her current and upcoming blog entries.
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