Eli5: how blue eyes are different

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I keep hearing that other color eyes have pigment to make them that color but with blue eyes they have no pigment and it is the physical structure that only reflects blue.

How is that any different than any other color?

Doesn’t red paint only look red because it reflects red light?

Doesn’t brown pigment only look brown because it reflects brown light?

I thought that is how all color worked, by reflecting only that kind of light.

People say it about blue eyes like it’s somehow different but it sounds the same to me

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7 Answers

Anonymous 0 Comments

Blue Eyes do have pigment. If you have no pigment in your iris at all, you’ll have red eyes (like albinos do).
But people with blue eyes have less pigment.

The blue itself comes because of complicated physics: blue light has the highest frequency wavelength; this means it wiggles about a lot more than other colours do and thus has a larger change of hitting a molecule and being reflected away (absorbed). The same reason the sky is blue.

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