one red eyed one black eyed

just wondering how common it is for a rat to have 2 diffrent colored eyes. i have some white dumbos with black, red, and a now one with one of each of the eye color. here is a bad pic cause she wouldnt stay still for long enough lol
http://i86.photobucket.com/albums/k8...xanthic015.jpg
http://i86.photobucket.com/albums/k8...xanthic018.jpg
and here are some of the white dumbos i have
http://i86.photobucket.com/albums/k8...xanthic011.jpg
http://i86.photobucket.com/albums/k8...xanthic013.jpg
i wonder if there is a better way to capture the eye color.... they are my up coming breeders so i dont handle these.