Why do people have two different colored eyes?

By on

It’s pretty rare, but as Mei Fleming, OD tells us, less than 1 percent of the population are born with two different colored eyes, known as heterochromia. Each year on July 12, we celebrate this unique trait with National Different Colored Eyes Day.

Why do people have two different colored eyes?

“Most causes of heterochromia are genetic,” explained Mei Fleming, OD. “It’s inherited and usually it doesn’t cause any vision problems.”

The eye condition is a result of either an excess or a lack of melanin, a natural pigment that determines our eye, skin and hair color. According to Dr. Fleming, heterochromia can show up in various ways.

“Heterochromia can be very subtle, or it can be sectorial, meaning a section of the iris is a different color, or it can be the entire iris where one eye is a completely different color than the other,” said Dr. Fleming.

Although typically genetic, a person can still develop heterochromia later in life.

“If you acquire heterochromia it could be due to trauma to the eye, medication you may have taken or some disease,” said Dr. Fleming. “Any acquired changes in the color of your iris needs to be evaluated by an optometrist.”

A comprehensive eye exam with you eye doctor can rule out any serious issues. Use our helpful tool to Find a Doctor near you.

Can you name a celebrity with heterochromia? Watch Dr. Fleming on this episode of #AskAnEyeDoc to see if your answer matches up.

Leave a Reply

Your email address will not be published.

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>