It's a form of piebaldism. Involves irregularities in the pigment cell migration in the layer that goes towards the eyes some other organs that use melanin(from the pigment cells) etc in the embryo- if it's slow or fails in migrating to an eye.. it will blue. Overly simplistic but that's the general idea. If I didn't have that, both of my eyes would be green but also alternatively, it could have been slow to both eyes, making both eyes blue. Also in many cases it's an autosomal dominant gene but with highly variable expression, of course. I'm the only one in whole family so perhaps it's a new mutation in me..
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