Actually, some of us idiots know that the black spot is called the iris. The color around it is the pupil, and the white is the sclera. I would have it checked, but I wouldn't worry too much. Yellow in the eyes can be caused by a lot of things. The primary medical dysfunction that causes this is jaundice, which indicates a problem in the liver. Diet can affect this, as can many other non disease events. Aodhan Haha...must have got mixed up when I posted that post. So dumb of me.