I know exactly what this is as I have been diagnosed with the same problem. Some of the "vitrious gel" in the eye has leaked onto the surface of the eye causing the lightning flashes in your periphial vision. You may also notice black dots in your vision and/or worm-like streaks appearing. You need to be checked by an opthomologist to be sure you are not in danger of having a "retinal detachment." Use your search engine to find "symptoms of retinal detachment" to help you better understand. I was told that so far my retina is fine, but the lightning flashes, worms and dots will be with me the rest of my life (I'm 56). My healthy eye is working twice as hard so I end up having more migraine than I ever had before and those are bad enough. I wish you well and hope you find a good eye-care specialist that can keep you better informed. My thoughts are with you!View Thread
My 90 year old mother has the same problem. The doctors told her it was related to her cataracts adn glaucoma problem. She had the cataracts removed and no longer has the "ghost figures" or "watermarks" that you call them.View Thread
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