Re: Colour change at races
I was interested, so I found a link:
Researchers say their findings that horses have reduced colour vision compared to humans and only differentiate objects in a palette of blues and yellows are important not just for racing but for other disciplines too and will be widely shared.
As a result of the research, which showed horses see the current orange framework used on jump racing fences as a shade of green, horseracing authorities have agreed to trial fluorescent yellow and white marks to aid visibility.
The cutting-edge research by the University of Exeter, commissioned by the British Horseracing Authority (BHA) and Racing Foundation, showed horses adjusted their jump angles when orange was not used, with white tending to produce a longer total jump distance.
There's orange in this picture but a horse doesn't see it: