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Kate Bosworth is known for having one blue eye and one hazel eye: her left is described as blue and her right as hazel. The difference is called complete heterochromia, or heterochromia iridum. Public sources identify the trait, but do not establish a specific medical or genetic cause for Bosworth.
Does Kate Bosworth have heterochromia?
Yes. W Magazine describes Bosworth’s eyes as hazel and blue, and an Esquire interview specifies that her left eye is blue and her right eye is hazel. When each iris is a different color, the pattern is called complete heterochromia, also known as heterochromia iridum.
That describes the visible difference; it does not explain why it occurred. The public accounts cited here do not report a personal medical diagnosis, genetic test result or confirmed cause for Bosworth’s eye colors.
What causes different-colored eyes?
Eye color reflects pigmentation in the iris. Heterochromia can be hereditary, or it can develop because of changes during eye development, disease or injury. MedlinePlus notes possible causes that include bleeding, glaucoma or glaucoma medicines, a foreign object in the eye, mild inflammation in one eye and Waardenburg syndrome. These are general possibilities, not claims about Bosworth.
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Different-colored eyes do not necessarily indicate a health problem. Cleveland Clinic notes that many people with heterochromia have no underlying condition, while some cases are acquired and can be associated with one. The appearance alone cannot determine the cause.
What are the different types of heterochromia?
| Type | Where the color difference appears |
|---|---|
| Complete heterochromia (heterochromia iridum) | One iris is a different color from the other, as reported for Bosworth. |
| Sectoral or partial heterochromia (heterochromia iridis) | A section of one iris differs in color from the rest of that iris. |
| Central heterochromia | A differently colored ring appears around the pupil. |
These terms describe patterns, not causes. A clinician can assess whether a difference has been present for a long time or is new and whether an underlying eye condition is involved.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are two different-colored eyes dangerous?
Longstanding heterochromia is often harmless, but a new change in eye color should be assessed by an eye-care professional. MedlinePlus also advises having an infant with differently colored eyes examined so a health professional can rule out medical causes. The guidance is especially important when the difference is new rather than a stable feature.
There is no reliable prevalence figure established here for how many people have heterochromia. Cleveland Clinic says the exact percentage is unknown.
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