Eye color is a polygenic trait and is determined by the amount and type of pigments present in the eye. Human beings have many variations in eye color.
The vast majority of the world's people have dark eyes, ranging from brown to nearly black. Light brown eyes are also present in many people, but to a lesser extent.
People with very dark brown irises may appear to have black eyes. This is fairly common in people of African, Asian and, Native American descent.
Hazel is usually used to describe eyes that contain elements of both green eyes and brown eyes, sometimes transitioning from green at the edges to brown around the pupil.
Among human phenotypes, blue eyes are a relatively rare eye color.
Grey eyes are (an often lighter) variant of blue eyes. A wide variety of shades of grey exist, from the almost white (light grey) to dark.
Green eyes are rarer than brown, blue, and grey eyes.
A variant of blue eyes, blue-green eyes are quite rare.
Violet eyes are extremely rare and a variation of blue eyes.
Heterochromia (also known as a heterochromia iridis or heterochromia iridium) is an ocular condition in which one iris is a different color from the other iris (complete heterochromia), or where the part of one iris is a different color from the remainder (partial heterochromia or sectoral heterochromia). This uncommon condition usually results due to uneven melanin content.
Eye color