Heterochromia

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Heterochromia

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Heterochromia

Heterochromia is the presence of different colored eyes in the same person.

Heterochromia isuncommon in humans, butquite common in dogs (such as Dalmatians and Australian sheep dogs), cats, and horses.

Most cases of heterochromia are hereditary, caused by a disease or syndrome, or due to an injury. Sometimes one eye may change color following certain diseases or injuries.

Specific causes include:

• Familial heterochromia (autosomal dominant transmission)
• Waardenberg syndrome (congenital and autosomal dominant)
• Some medications used to treat glaucoma may cause the iris (colored part of the eye) to darken
• Neurofibromatosis (may cause the affected iris to darken)
• Injury, hemorrhage (bleeding), glaucoma, or foreign body in the eye

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