Hell, I don't really understand the physics of visual light. From what little I think I know about how it works...
...I guess authors are assuming that "Y creature is colorblind for X color" (example: hunting safety vests are bright orange because deer are red-orange colorblind) automatically means "Y creature's eyes are unable to perceive X color as part of the visible spectrum" (sort of how humans can't see infra-red or UV light)
...in which case anything intelligent should still be able to track a moving object, since the moving object would seem to be obscuring anything it passes in front of, a la Ambrose Bierce's "The Damned Thing": http://www.sff.net/people/doylemacdonald/L_damned.htm