Heterochromia iridum may be part of a genetic condition. It also may be caused by a growth on the eye or happen after an eye injury.
Sometimes, the color of the iris in one eye might be different from that of the other eye. For example, one eye is blue and the other brown.
An eye exam should be done to check for a cause of heterochromia iridum. The condition is usually harmless, and most people do not need treatment.