Just read an article on this.
"Deer are probably like a person with red-green color blindness, which means they can see blue and into the yellow-orange range, but probably can't distinguish green and red or see as deeply into the color spectrum as we do."... "It's pretty safe to say that blaze orange doesn't stand out to a deer, so there's absolutely no excuse not to wear it."..."Deer probably don't possess the yellow filter humans have to protect our eyes from ultraviolet light damage. If that's the case they may perceive blue better thean we do."

I hope this helps. The full article is in the november edition of Field and Stream