Why do some people have one eye that is slightly different from the other?
Quick Answer
Small differences between the eyes are common because each eye develops separately and may not match perfectly in shape, color, or size. Mild asymmetry is usually normal human variation.
The Full Story
Human faces are naturally asymmetric, and the eyes are no exception. One eye may be slightly larger, sit a little higher, or have a different eyelid shape because of normal developmental variation. Differences in iris color can also occur, and in some cases a person may have heterochromia, where the eyes or parts of the eyes differ in pigmentation. Most of these differences are harmless, though sudden changes in eye appearance should be medically checked. The small asymmetries are part of what makes each face unique.
Key Facts
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"Why are no two eyes on a face ever perfectly alike?"
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