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This has only happened a couple of times - first time about 6 months ago and then again tonight. Both times, I'd worked very hard - the first running 10k fartlek but really pushing it and tonight after a spin class. About 15 mins after exercise, I notice part of my vision is blurred - a bit just off centre , with a couple of squiggly line type things. Very disorienting, but it goes after about an hour. Any ideas? Any others have experienced this?