Everything You Need To Know About Heterochromia: Types, Causes & Rarity

The Causes Of Heterochromia In Human Eyes

The color of the irides develop during the first few months after birth. The levels of the pigment melanin determine how dark the irides will become. The less melanin expressed, the lighter the color of the irides, and vice versa. When the concentration and distribution of melanin are inconsistent, the resulting condition is heterochromia. Most people with heterochromia are born with the condition, which is usually inherited. The condition may also result from a genetic mutation during embryonic development, and sometimes, heterochromia is a symptom of another condition. Horner’s syndrome results when a group of nerves called the sympathetic trunk is damaged and is an example of a condition that causes heterochromia. Waardenburg syndrome is another cause.