Hello, when I exercise, specifically when I do jogging while standing, I see a pattern of lines in a circular pattern, they're whitish, I don't know if this would classify as flashes, It feels like they're in sync with my heart beat. I've first noticed this 9 years ago when I was running a marathon and pushed myself hard. I told my opthalmologist about it at the time and he saw my retina then told me it's nothing.