I don't know what the true science is but I have been picked off a few times where it really made me wonder.
One day,with several inches of snow on the ground,I had a doe coming by me with a nice buck following.I was on my knees,next to some brush,wearing snow camow,a white hat and gloves.
The wind was perfaect.I just needed for her to pass and all of his attention was on her.I hunched over with forearms on the ground and got as low as I could-snow everywhere.
When she got even with me at about 50',she slammed on the brakes like she had seen a neon sign,and spooked out of there.I can't for the life of me figure that one out unless there is something to the UV thing.
I'd like to here more,from people who know.