The eyes are said to be the windows to the soul, but did you know your genes are a window to your eyes? Eye color refers to the color of the iris, which can be blue, green, hazel, brown, or many shades in between.

This Genome App calculates the probability of having a specific eye color using your DNA and the HIrisPlex system, a logistic regression model.

Eye color is determined by variations in a person’s genes. Most of the genes associated with eye color are involved in the production, transport, or storage of a pigment called melanin. Eye color is directly related to the amount and quality of melanin in the front layers of the iris. People with brown eyes have a large amount of melanin in the iris, while people with blue eyes have much less of this pigment.

• The world's most common eye color is brown.
• Brown eyes are actually blue underneath.
• Blue-eyed people share a common ancestor with every other blue-eyed person in the world.
• Heterochromia is when you are born with two differently colored eyes.