What defines the color of the iris?

In a normal healthy eye, the color of the iris is defined by genetic inheritance. In children, initially the color is gray or light blue and it is between 6 and 10 months of age when the final color is fixed. This will depend on the amount and color of the melanocytes (cells that contain the pigment melanin). In this way, if the melanocytes are concentrated on the posterior surface of the iris, the eye will be blue, while if it is distributed throughout the thickness of the iris, the eye will be brown.

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