Anyone know why some people have 2 different coloured eyes?

Question:I'm studying genetics at the moment, and my teacher was unable to answer this question.

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). It is a result of the relative excess or lack of pigment within an iris or part of an iris, which may be inherited or acquired by disease or injury. This uncommon condition usually results due to uneven melanin content. A number of causes are responsible, including genetics such as chimerism and Waardenburg syndrome. Trauma and certain medications, such as latanoprost can also cause increased or decreased pigmentation in one eye. On occasion the condition of having two different colored eyes is caused by blood staining the iris after sustaining injury.

Actress Kate Bosworth has one blue eye and one hazel eye. Lead singer Tim McIlrath of Rise Against has one brown eye and one blue eye. Actress Jane Seymour has one brown eye and one green eye. Actress Demi Moore has one green eye and one hazel eye.

Contrary to popular belief, David Bowie does not have heterochromia. When he was young, Bowie was punched in the left eye by a classmate wearing a ring. This injury caused the pupil of his eye to remain dilated, commonly being mistaken for a differing iris color.
Just lucky I guess

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