<P> They are most common in Northern, Western and Central Europe . In Ireland and Scotland 14% of people have brown eyes and 86% have either blue or green eyes, In Iceland, 89% of women and 87% of men have either blue or green eye color . A study of Icelandic and Dutch adults found green eyes to be much more prevalent in women than in men . Among European Americans, green eyes are most common among those of recent Celtic and Germanic ancestry, about 16% . 37.2% of Italians from Verona and 56% of Slovenes have blue / green eyes . </P> <P> Green eyes are common in Tabby cats as well as the Chinchilla Longhair and its shorthaired equivalents are notable for their black - rimmed sea - green eyes . </P> <P> Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer . Hazel eyes often appear to shift in color from a brown to a green . Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown / gold or green . This is how many people mistake hazel eyes to be amber and vice versa . This can sometimes produce a multicolored iris, i.e., an eye that is light brown / amber near the pupil and charcoal or dark green on the outer part of the iris (or vice versa) when observed in sunlight . </P> <P> Definitions of the eye color hazel vary: it is sometimes considered to be synonymous with light brown or gold, as in the color of a hazelnut shell . </P>

What is the percentage of hazel eyes in the world