How can foreigners eyes still be green

It is well known that Easterners have black eyes and Westerners have blue eyes. So, why do people of different races have different eye colors?

The eyeball here refers to the anterior middle part of the eyeball, which is made up of the cornea, iris, and pupil. Since the cornea is colorless and transparent, the color of the eye is the color of the iris.

So, why are Oriental eyes black and Westerners light blue? This should be discussed in terms of the structure of the iris of the eyeball.

Scientists have found that the iris of our human eye is made up of five layers of tissue. They are the endothelial cell layer, the anterior bounding membrane, the stromal layer, the posterior bounding membrane, and the posterior epithelial layer. In these five layers of tissue, the stromal layer, the anterior bounding membrane, and the posterior epithelial layer contain many pigment cells, and the amount of pigment contained in these cells determines the color of the iris.

The more pigment contained in the pigment cells, the darker the iris and the darker the eyeballs. And the less pigment, the lighter the color of the iris, and the lighter the color of the eyeballs.

The pigment content in pigment cells is consistent with color and is related to ethnicity genetics. Orientals are people of color, and the iris has a lot of pigment, so the eyes look black; Westerners are white and have little pigment in the iris and blood vessels in the stromal layer, so the eyes look light blue.

As for the green, it should have something to do with the living environment!

What nationality is Green Eyes?

To put it simply, because the United States is not like China, it is a "big family" composed of pure yellow people

You can tell that there are not a few blacks in the USA.

With a green card, you have the status of a U.S. citizen.

The true American nation is the Indians.

The vast majority of people have immigrated from their ancestors.

If you often watch foreign movies.

You'll find a lot of lines that are.

I'm from Mexico.

Or I'm from Canada, Finland, etc.

That's why it's said that Americans have a lot of skin color.

The eyes of the United States and Russians are blue, and the eyes of the Russians are less pigmented in the iris, so the eye color is a lighter blue.

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

The iris is broadly divided into two layers: the iris stroma and the epithelial cell layer that covers the anterior. The epithelial cells on the back of the iris all contain pigments.

The color of the iris is related to two pigments. These two pigments are known as melanin and lipoprotein. Melanin is black and lipoprotein is yellow.

The more pigment a cell contains, the darker the iris is.

Foreigners also have dark eyes, mainly looking at cytochromes.

Like my eyes are brown.

Our pupils are all black. Light is a kind of electromagnetic wave, and you can see different colors because of the length of the band, and the position of different wave segments on the optical axis is different. It is said that green protects the eyes, green only plays a role in relieving eye fatigue, if you think that blue will protect the eyes, then why do blue-eyed foreigners also wear so many glasses, right?

Playing less with things like computers and mobile phones, and going out to exercise more is the truth to protect your eyes

Well, it's a long story.

To make a long story short, from a biological point of view, mainly n years ago, when human beings had not yet evolved completely, due to the great differences in the climate and environment and other conditions in various regions, it was inevitable that the inheritance and variation of biological genes would be affected in the process of evolution.

Not only the eyes, but also many aspects are different, such as Westerners are taller. It is impossible for everything to be the same, even if it is the same twins in the same continent and region, it is difficult to find two people who are exactly the same, and the eyes are no exception, and the eye color of the people around you is also different, but the closer the conditions, the smaller the difference!

Why blue, green, black, the question is as unexplained as if you were asking whether there was a chicken or an egg! Just like why normal people have two eyes, a nose and a mouth, it is so simple, mainly because the various pigments produced in the body are different in different climates, or it happens to become natural after a long time. That is the most primitive explanation, it takes a long history, and the explanation now or in a short period of time is mainly due to genetics, and it is impossible to change a lot all at once because of different circumstances!

..That's basically it!