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Central heterochromia: the ring around the pupil
Central heterochromia is a ring or starburst of a different color around the pupil, most often gold, amber or brown inside a green, blue or gray iris. It usually appears in both eyes, is present from early life, and is benign. Many eyes called hazel are central heterochromia under another name.
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VerdictRing around the pupil
Verdict
Ring around the pupilA different-colored ring around the pupil, present since childhood, is a benign pigment pattern
Detect your eye color: Eye color detector →What central heterochromia looks like
The iris has two distinct color zones arranged in circles: an inner zone around the pupil and an outer zone reaching the edge. The inner zone is usually warmer, gold, amber, orange-brown or light brown, and the outer zone is green, blue or gray. The border can be a clean ring, a jagged starburst, or spokes of the inner color reaching outward.
It usually affects both eyes in a similar way, which separates it from complete heterochromia, where the two eyes differ. The inner ring varies in width from a thin halo to a band covering half the iris. It is easiest to see in bright light, when the pupil is small and the full inner ring is exposed.
Central heterochromia vs hazel
The overlap is large. Hazel eyes have a brown or gold center with green toward the edge, which fits the definition of central heterochromia. In practice, people say hazel when the two zones blend and the eye reads as one mixed color from a distance, and central heterochromia when the ring is sharply defined and the outer color is clearly blue, gray or green.
A gold ring in a blue eye is almost always called central heterochromia, since nobody would call that eye hazel. A brown center fading into olive is usually just called hazel. Neither label is more correct. The underlying cause is the same: more melanin near the pupil than at the edge of the iris.
Why it happens, and whether it matters
Pigment in the iris is laid down during infancy and early childhood, and it does not always spread evenly. In central heterochromia, more melanin collects in the zone around the pupil than in the outer iris. The pattern is thought to be largely inherited, like eye color itself, and it tends to be stable once early childhood is over.
When it has been there since childhood, central heterochromia is usually benign and has no effect on vision. The exception is change: a new color change in an adult, or a change in one eye only, should be seen by an eye doctor promptly, because causes can include injury, inflammation or certain glaucoma eye drops that darken the iris.
How common it is
Nobody has a reliable figure. Central heterochromia is often described as the most common form of heterochromia, and it is certainly more common than complete heterochromia, but it goes largely uncounted because most people with it describe their eyes as hazel, or as green or blue with a gold ring. Online claims of a precise percentage are not based on any census, because none exists.
It is most noticeable in light eyes, simply because a warm ring stands out against blue, gray or green. In brown eyes a slightly different inner ring is common but hard to see, since both zones are brown. So some people have it without anyone noticing, and others notice it only in bright sun.
Why the ring shows in some light and not others, and how to check
Pupil size is the biggest factor. In dim light a large pupil covers much of the inner ring, so the eye looks a single color; in bright light the pupil shrinks and the ring appears. Warm light makes the gold ring seem to spread into the outer color, while cool daylight separates the two. Clothing and camera white balance also shift the outer color toward blue, green or gray.
To see it clearly, face a window in daylight with no flash, give your pupils a moment to settle, and look at the ring near the pupil and the outer edge separately. Check your color with the eye color detector on this site, which reads the iris on your device and corrects for lighting, then use the color season analysis to pick shades that suit the outer color.
FAQ
Common questions
Is central heterochromia rare?+
It is less rare than people assume. It is often described as the most common form of heterochromia, but it goes uncounted because many people with it simply call their eyes hazel. No reliable percentage exists.
Is central heterochromia the same as hazel eyes?+
They overlap. Hazel is a brown or gold center with a green edge, which is a form of central heterochromia. The term central heterochromia is used more when the ring is sharp and the outer color is clearly blue, gray or green.
Is central heterochromia bad?+
No, when it has been present since childhood. It is a benign pigment pattern with no effect on vision. A new color change in an adult is different and should be checked by an eye doctor.
Can central heterochromia appear later in life?+
The pattern usually settles in early childhood and stays stable. A ring or color change that appears in adulthood is not the same thing and is worth an eye exam.