With all of the different eye colors in existence and all the beautiful shades of blue, green, gray and brown, below we examine the reasons why such eye color disparities occur in people.  Scientists used to believe that the only colors in existence were blue, green and brown, but recent research has uncovered many different shades of each eye color and these all exist along a continuous spectrum.  So, where does your eye color come from and what role did your genes play in this determination?