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when did these start? what exacty do you see? is it one eye ? both eyes? one then other? how long does the flashing last? is it a spark kind of flash off to the side? or more like a kaleidascope type of lights in a zig zag pattern? Any headaches after these episodes? When did you have the retina evaluated?
I see patients with similar symptoms quite often. Folks often describe a bright or colorful pattern (sometimes wavy or zigzag in nature) and it can be in one eye and moves to the other, sometimes affecting the central vision. Sometimes there is a headache following this as well. This is called an ophthalmic migraine. The name should not be confused with a migraine headache which is altogether different. The ophthalmic migraine is a visual phenomenon and is benign and requires no treatment, except for more rest, less stress. Sometimes caffeine can help shorten the episode. Just to be sure, you should see an ophthalmologist and get your eyes checked out sometime, Regards