Exploring Heterochromia: A Multicolored Phenomenon

Heterochromia refers to a difference in coloration, usually of the iris but also in hair or skin. Human heterochromia is a rare condition, affecting less than 1% of the population.

There are three types: complete (each iris a different color), sectoral (part of one iris is a different color), and central (spikes of different colors radiate from the pupil).

Heterochromia can be inherited or caused by genetic mosaicism, chimerism, disease, or injury. Acquired heterochromia is often a symptom of an underlying condition or trauma.

Celebrities like David Bowie and Mila Kunis have brought attention to heterochromia. Bowie's case, however, was an illusion caused by a dilated pupil from an injury.

Heterochromia generally does not affect vision. However, in rare cases, it can be associated with other conditions like Horner's syndrome that may impact eyesight.

Throughout history, heterochromia has been viewed with superstition and fascination. Some cultures have considered it a sign of witchcraft, while others see it as a mark of beauty.

Heterochromia is more common in animals than humans. It is often seen in dogs, cats, and horses, and unlike in humans, it can be a breed characteristic, especially in huskies and Australian cattle dogs.