 Eye color is considered a subset of coloring , and coat color definitions often include standards for the eyes , as many genes which control eye color will also affect the coat color or vice versa . The American Fancy Rat and Mouse Association ( AFRMA ) lists black , pink , ruby , and odd @-@ eyed ( two different @-@ colored eyes ) as possible eye colors , depending on the variety of rat shown . Ruby refers to eyes which at a glance appear black but which are on closer observation a deep , dark red . 
