What causes heterochromia in humans

One person, two eye colors (heterochromia) - does that really exist?

One eye green, one eye blue, this is called heterochromia. How does that work? Do people with different colored eyes have different genes? Can you see better or worse? Or is the phenomenon of two eye colors just an interesting unique selling point?

How is eye color created?

The color of the eyes is a basic human characteristic. Once pronounced, it accompanies us for a lifetime and is even noted in the passport. The amount of the pigment melanin in the iris, which exists in different shades and amounts, is responsible for the color. A high concentration of melanin results in brown eyes. A smaller proportion makes the iris appear in shades of green, gray and blue. Or to put it another way: the less melanin, the bluer the eyes glow.

What is the cause of different eye colors?

The colors of both eyes are seldom identical, but quite similar. However, as is well known, exceptions confirm the rule. For example, the color of the iris of the left eye can be different from that of the right eye. This is a pigmentation disorder known in technical jargon as iris heterochromia. However, it is much more common in animals than in humans.

Are the eyes always completely different in color?

No, it doesn't have to be. In heterochromia, there is usually a lack of melanin pigmentation in sections of one eye. The undersupplied part appears bluish. Often only an iris segment running diagonally to the center deviates in color - this is called sectorial heterochromia. If a different colored ring is visible in the middle of the iris, this is called central heterochromia. This form of heterochromia is relatively common.

Can everyone have eyes of different colors (heterochromia)?

The noticeable color differences in the eyes can be caused by a congenital abnormality. In exceptional cases, however, they are also the result of an inflammation of the iris or a symptom of another disease. Often there is also an unequal pupil size.

Do different colored eyes need special treatment?

Different eye colors rarely lead to physical discomfort or impaired vision. Therefore most of the time no treatment is required. Sometimes, however, this phenomenon is associated with hearing loss, which should be diagnosed and treated.

What looks interesting to many people can also be stressful for those affected. Here, however, there is an uncomplicated remedy: tinted contact lenses transform the unique selling point into an average attribute in no time at all.

Discover more visual fairy tales and get to the bottom of visual myths. Or send us your own question now, simply by email or Facebook Messenger.


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