Authors:

Most eyes have more than one color, but usually they're related. Blue eyes may have two shades of blue, or blue and gray, or blue and green, or even a fleck or two of brown. Most people don't notice that.

Elizabeth Moon (2004). “The Speed of Dark: A Novel”, p.70, Ballantine Books
Most eyes have more than one color, but usually they're related. Blue eyes may have two shades of blue, or blue and gray, or blue and green, or even a fleck or two of brown. Most people don't notice that.