When riding my bike through dapples light (wooded trails) it causes my vision to see everything in a strobe light way, like I'm watching the trail though a film that skipping frames (this isn't just the dappled light, it's much worse than just dappled light). I have to stop riding and wait 5-15 minutes and it goes away. After that I continue to ride through dappled light and everything is fine. My heart rate is normal (wearing hr monitor) during these episodes and I'm on no medication and I'm healthy.
What can cause this?