Brown Eyes

Shades of Brown

Amber

Human amber eyes displaying the yellow pigments.

Amber eyes are of a solid color and have a strong yellowish/golden and russet/coppery tint. This might be due to the deposition of the yellow pigment called "lipochrome" in the iris (which is also found in green and violet eyes). Amber eyes should not be confused with hazel eyes; although hazel eyes may contain specks of amber or gold, they usually tend to comprise many other colors, including green, brown and orange. Also, hazel eyes may appear to shift in color and consist of flecks and ripples; while amber eyes are of a solid gold hue.

The eyes of some pigeons contain yellow fluorescing pigments known as pteridines. The bright yellow eyes of the Great Horned Owl are thought to be due to the presence of the pteridine pigment xanthopterin within certain chromatophores (called xanthophores) located in the iris stroma. In humans, yellowish specks or patches are thought to be due to the pigment lipofuscin, also known as lipochrome.

Brown

Brown eyes are predominant in humans and, in many populations, it is (with few exceptions) the only iris color present.[31] It is less common in countries around the Baltic Sea and in Scandinavia.

In humans, brown eyes contain large amounts of melanin within the iris stroma, which serves to absorb light, particularly at the shorter wavelengths. Brown eyes are the most common eye color, with over half of the world's population having them. They are also the most dominant eye color gene. Very dark brown irises may appear at a glance to be black.

Hazel

Hazel eyes are due to a combination of a Rayleigh scattering and a more than moderate amount of melanin in the iris' anterior border layer. Hazel eyes often appear to shift in color from a light brown to a medium golden-dark green. A number of studies using three-point scales have assigned "hazel" to be the medium-color between the lightest shade of blue and darkest shade of brown. This can sometimes produce a multicolored iris, i.e., an eye that is light brown near the pupil and charcoal or amber/dark green on the outer part of the iris (and vice versa) when observed in sunlight. Hazel is commonly found in Europe, some regions of the Middle East, North America, parts of Central Asia and parts of South Asia.

Definitions of the eye color "hazel" vary: it is sometimes considered to be synonymous with light-brown and gold. In North America, "hazel" is often used to describe eyes that appear to change color.

Source: Wikipedia

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