Which country has blue eyes? Whose eyes are green?

In the United States and Russia, the eyes are blue, but in the United States and Russia, the iris pigment content in the eyes is less, so the eyes are lighter blue.

The color of the eye refers to the color of the middle part of the eyeball covered by the iris. Iris contains many pigment cells, and the content of melanin in pigment cells determines the shadow of iris. The darker the eyes; The less pigment content, the lighter the iris color and the lighter the eye color.

Iris is roughly divided into two layers: iris matrix and epithelial cell layer covering the front. Epithelial cells on the back of iris contain pigment. The color of iris is related to two pigments. These two pigments are called melanin and lipoprotein. Melanin is black and lipoprotein is yellow.

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Extended data:

Color of human eyes:

1, brown is the most common color for human eyes. Brown eyes contain a lot of melanin, and dark brown eyes look like black. Light brown eyes are caused by Rayleigh scattering in the anterior layer of iris and moderate melanin.

Blue eyes are more common in Europe, and about 8% people in the world have blue eyes. More than 80% of Nordic countries are blue-eyed Icelanders, Finns and Latvians.

Amber is the most common among animals. It is lighter than brown, and it is rare even in humans. It's called cat's eye now.

4. Green eyes are the rarest color. Among the Celts in Europe, the proportion of Germans and Slavs is higher; Outside Europe, some Pashtuns and Turks also have green eyes.

5. The formation of red is mainly due to albinism caused by some congenital pigment deficiency. Red is the color of red blood cells.

6. Gray is considered as a variant of blue iris and the second rarest color.

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