How Many People Have Heterochromia?

Heterochromia Iridis is a condition that affects approximately six in 1,000 individuals, and is often present at birth, according to MedicineNet. This condition causes both irises of the eye to be different colors from one another, which is usually the only symptom of Heterochromia Iridis. In most cases of the condition, patients do not suffer from any visual impairments.

Heterochromia Iridis is a rare condition which could be hereditary or acquired from an eye disease. With hereditary Heterochromia, there might be other abnormalities in the body or eye, which could cause other symptoms. Conditions other than Heterochromia that are known to cause someone to have two different colored pupils include Waardenburg syndrome, Congenital Horner's syndrome and Tuberous sclerosis.