The biggest one is a personal history of having migraine headaches. There are some characteristics that raise your risk for ocular migraines. They will have three or four episodes within a week and then may not have another one for several months or even years. Many people who get ocular migraines tend to have them occur in clusters. If you have this happen for the first time it can be scary and it is a good idea to have a thorough eye exam by your eye doctor soon after the episode to be sure there is nothing else causing the problem. The hallmark of this problem is that once the visual phenomenon resolves the vision returns completely back to normal with no residual change or defect. The majority of episodes last about 20 minutes but can go on for an hour. They get the visual symptoms, which resolve on their own in under an hour, and then generally just feel slightly out of sorts after the episode but don’t get a significant headache. Some people do get a headache after the visual symptoms but most do not. They can take on either positive or negative visual symptoms, meaning they can produce what looks like a black blocked-out area in your vision (negative symptom), or they can produce visual symptoms that you see but know aren’t really there, like heat waves or jagged white lines that look almost like lightning streaks (positive symptoms). They can take on several different symptoms but typically last from a few minutes to an hour. Ocular migraines occur when blood vessels spasm in the visual center of the brain (the occipital lobe) or the retina. If you have, you may have been experiencing what is known as an ocular migraine. Have you ever seen a temporary black spot in your vision? How about jagged white lines? Something that looks like heat waves shimmering in your peripheral vision?
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