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A major nuisance. The usual sort of migraine, the one that gives everyone headaches, is caused when a blood vessel somewhere in your brain pinches shut and causes an uncomfortable sort of feedback. Ocular migraines are just like that, except the blood vessel is in your retina. It causes weird, vibrating psychedelic patterns to take up part of your vision for several minutes and, sometimes, gives you an annoying headache to go along with it.

I'm having one right now. It makes it rather difficult to read what I'm typing. Not to mention the headache.

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