44+ Most Common Eye Color In The World Background. The appearance of color in a person's eye is a function of the pigments included within the iris. So what's probably going to happen (if blue eyes continue to become more so the trend essentially is that wherever you are in the world, the least common eye colours in that area.
However, the shades of brown vary greatly depending on the region where someone is born.
You may have already noticed this fact: The next most common colors are blue and grey, and green is the rarest color. Brown is the most common eye color occurring in about 55 percent of the global population. These genes account for the most common colors — brown, blue and green.