Heterochromia is the difference in coloration of the iris, skin and hair. Heterochromia is a result of the relative excess or lack of melanin (pigment). It can be from genetics, injury, or disease near and in the eye.
In both cases, central and sectoral, there is a slight chance of getting disease, but in most cases, you don't get it.
Injury and genetics can cause this condition. Some diseases, such as Waardenburg syndrome (a genetic condition that can change color of the hair, skin and/or eye) can cause a problem which is hearing loss. An injury causing this condition is having blood in the anterior from trauma can cause Heterochromia Iridis.
In both cases, central and sectoral, there is a slight chance of getting disease, but in most cases, you don't get it.
Injury and genetics can cause this condition. Some diseases, such as Waardenburg syndrome (a genetic condition that can change color of the hair, skin and/or eye) can cause a problem which is hearing loss. An injury causing this condition is having blood in the anterior from trauma can cause Heterochromia Iridis.
Central heterochromia iridis
Partial/sectoral heterochromia