For years I had migraine headaches & would have things that I can only describe as like tadpoles squiggling, sometimes fast & sometimes slow, sometimes very light gray, almost white, sometimes a very dark black. I'd also get zig-zag lines of various colors. These were almost blinding sometimes. No more migraines but I still get the fast moving multi-colored zig-zag circles. Some have said it is migraines & sometimes you have the terrible headaches & sometimes just the zig-zags.View Thread