“worst resulted in loss of colour vision (which I only noticed when it returned),”
I had that twice last year (2nd time in my SM100 DNF). I ended up crashing in a rock garden and splitting my knee open pretty good. After medical bandaged me up trailside, I decided to ride the 8 road miles back to the aid station where my wife was volunteering. After significant hike a bike on the normally easy road section back, I arrived at the aid station and was informed by my wife that we were going to the Dr to get my knee cleaned/stitched up. Once at Prompt care, before they did anything, the room turned white and the next thing I knew, they were offering me crackers and a Coke. Then they informed me that I had had a seizure of some sort, passed out and my blood pressure had dropped to the point that they couldn’t feel a pulse. After a couple cokes, fries and a burger, I was “ok” although I didn’t want to look at my bike for about a week…