Masks are optional for all visitors and staff. Please see our current COVID-19 policies here.
We require appointments for all examinations and optical-related visits.
If you have questions or want to schedule an appointment, call us at (636)272-1444

alarm-ringing ambulance angle2 archive arrow-down arrow-left arrow-right arrow-up at-sign baby baby2 bag binoculars book-open book2 bookmark2 bubble calendar-check calendar-empty camera2 cart chart-growth check chevron-down chevron-left chevron-right chevron-up circle-minus circle city clapboard-play clipboard-empty clipboard-text clock clock2 cloud-download cloud-windy cloud clubs cog cross crown cube youtube diamond4 diamonds drop-crossed drop2 earth ellipsis envelope-open envelope exclamation eye-dropper eye facebook file-empty fire flag2 flare foursquare gift glasses google graph hammer-wrench heart-pulse heart home instagram joystick lamp layers lifebuoy link linkedin list lock magic-wand map-marker map medal-empty menu microscope minus moon mustache-glasses paper-plane paperclip papers pen pencil pie-chart pinterest plus-circle plus power printer pushpin question rain reading receipt recycle reminder sad shield-check smartphone smile soccer spades speed-medium spotlights star-empty star-half star store sun-glasses sun tag telephone thumbs-down thumbs-up tree tumblr twitter tiktok wechat user users wheelchair write yelp youtube

Heterochromia: Causes And Types

Have you ever seen someone with eyes that are two different colors?

This fascinating trait is called heterochromia, and only six people in a thousand have it. It can happen in different ways and for different reasons. Even if you haven’t seen someone with different colored eyes, you’ve likely seen an odd-eyed dog or a cat. But how does such a strange-looking thing happen?

What Causes Heterochromia

Most of the time, heterochromia is simply congenital (meaning the result of genetics) and caused by a benign mutation affecting the way melanin (pigment) develops in the irises. A few famous examples of congenital heterochromia are Mila Kunis, Jane Seymour, Simon Pegg, and Anthony Stewart Head.

People who weren’t born with heterochromia might still develop it, as it can also be caused by trauma (due to injury or surgery) or disease (such as diabetes, eye tumors, or glaucoma). Acquired heterochromia might look as interesting as congenital heterochromia, but it often indicates the eye is damaged or unhealthy. The most famous example of it is David Bowie, whose left iris remained permanently dilated after an injury, giving him the appearance of having different colored eyes.

[iframe https://www.youtube.com/embed/rFqYTJHqMOQ?rel=0 620 349]

Types Of Heterochromia

Just as heterochromia can be the result of a variety of causes, it can also produce a wide range of results. The three categories are complete, segmental, and central heterochromia. Complete heterochromia, also called heterochromia iridum, occurs when the two irises are different colors. Segmental heterochromia, also called heterochromia iridis, occurs when a patch of a different color appears in one iris.

Central heterochromia is more common than the other types, but not nearly as visually striking. It happens when the irises match each other but have a ring of a different color around the pupils. For instance, someone with blue eyes might have a thin ring of hazel or brown around their pupils.

Heterochromia In Folklore

In our culture, heterochromia is merely an intriguing anomaly, but that hasn’t been the case for everyone. Some Native American cultures believe having heterochromia means the person can see into heaven and earth at the same time through different colored eyes. They refer to this as having “Ghost Eyes.” Halfway around the world, Eastern European pagans believe being born with heterochromia means the person has witch eyes!

Come See Us!

If you notice a change in the color of one or both of your eyes (particularly if you weren’t born with two different eye colors), it’s a good idea to schedule an appointment so we can discover the cause, in case it’s due to damage from an injury or the symptom of a health condition.

We love the unique eyes of all of our patients!

Top image used under CC0 Public Domain license. Image cropped and modified from original.
The content on this blog is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of qualified health providers with questions you may have regarding medical conditions.