Why the color of foreign eyeballs is different The color of American eyes

Why do people in the East and West have different eye colors.

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.

The color of the eye, although it is blue, black, green, and gray, is not its "true color". When we say eye color, we refer to the color of the middle part of the eyeball, which covers a layer of iris and contains many pigment cells, and the amount of melanin in the pigment cells determines the shade of the iris color. The higher the pigment content, the darker the iris and the darker the eyeballs; The less pigment there is in the pigment cells, the lighter the color of the iris and the lighter the color of the eyeballs.

Originally, the eyes were the same color, but the shades were different, but because the light-colored iris would reflect the blood vessels below, the effect of "color matching" made the eyes look light blue or green, and the Caucasian took advantage of it. Therefore, different eye colors do not affect the visual perception of color.

The melanin of the iris protects our eyes from bright light. Strong sunlight exposure is one of the main causes of cataracts, and light-colored eyes are more sensitive to light, which is a lot of losses, so Caucasians are more likely to suffer from cataracts.

Quack quack. It is determined by both the environment and the genes.

The color of the eyes depends on the color of the iris, and it depends on the amount of pigment, and there are ethnic differences. In the white race, the iris is light yellow or light blue due to lack of pigment; People of color have dark iris and tan because of their pigmentation. hoho

When it comes to their eye color, many people take it for granted that it's black. It is generally said in Chinese textbooks that Chinese (Han Chinese) are yellow**, with black hair and black eyes. Many Chinese also define Han people in this way.

Black hair and black eyes seem to be the typical image of Asians. But it's actually a common common sense mistake!

In fact, there are no black eyes in Asia. Asians only have brown eyes. Of course, brown eyes can also be light brown and dark brown. Chinese generally have dark brown eyes.

Many people believe that the eyes of pure Han people are black, and the eyes of Han people with mixed blood are brown. In fact, in Asia, there are no pure black eyes. It's just that sometimes the dark brown eyes look black.

The Chinese are brown, and only the Costa Ricans have pure black eyes.

When many people go abroad to fill out the application materials, they are always unsure whether to choose brown (brown) or black (black) when describing their eyes. I took it for granted that it was black, but when I actually looked in the mirror, I realized that it was actually brown. The most correct thing is actually brown.

We have always thought that we are black-eyed, yellow-eyed. But in fact, many people's skin tone is not yellow, dark, pink, dark and fair skin tone is possible. And most of us don't have pure black eyes, so please pick up the mirror and check your eye color and rarity.

Brown. Brown eyes account for about half of them, which means that most people have brown eyes, especially Asians. Brown is the most common eye color, similar to caramel color. Because brown pupils are dominantly inherited, they are easy to retain in heredity.

Brown. Brown eyes are lighter in color than brown eyes, and the overall hue is yellowish or greenish. Brown pupils have less pigment, so they look a little more transparent. However, the proportion of people with brown eyes is still relatively large.

Some of the rarer than brown eyes are blue eyes. Blue eyes may appear dark blue, turquoise, light blue or clear blue like ice depending on the pigment and platelet distribution. And blue eyes are not only the exclusive color of white people, but other races also have blue eyes.

And the black pupils that we always thought were our signature color are actually as rare as green. Compared to brown pupils, black pupils are pitch-black or rich dark brown, and the pupils are barely visible.

Other absolutely rare iris colors are gold, purple, red, and pink. In general, people with albinism have purple and reddish-pink. And there are some individuals who have different colors on the left and right pupils, or different colors in one pupil, all of which are unique

Americans have a wide variety of eye colors because the United States is a multi-ethnic and multi-racial country, and people's genetic backgrounds and genetic factors have led to a rich variety of eye colors. Here are some common eye colors for stuffy masks, including but not limited to Americans:

1.Dark brown: Dark brown eyes are common in Americans.

2.Hazel: Hazel eyes are also more common.

3.Blue: Blue eyes, although relatively rare, are still common among Americans.

4.Gray: Gray eyes are also present in some Americans.

5.Green: Green eyes are relatively rare, but some Americans have eyes of this color.

6.Silver: Silver eyes are also a very rare eye color that is rarely seen in Americans.

These colors are broadly categorized, and in fact there may be a variety of different subtle variations and mixtures of color in people's eye colors. In fact, there may be overlaps and differences between Americans' eye color and populations in other countries or regions, depending on genetics and demographics. <>

The genes of the human body have been affected to varying degrees, and in the process of human evolution, due to the different living environments, the rise of people and the different cultures, so many different human races have been formed. The color of the eye is determined by the pigment contained in the iris, and the color of the eye is also determined by the corresponding amount and type of pigment. Therefore, the reason why foreigners' eyes are blue is actually because they have special genes that cause the variation of eye color.

According to scientists, most Asians and Africans have mostly brown and black eye colors, while white people are able to have blue and green background colors because of their special genes. Unlike Asians and Africans, Europeans and other Caucasian genes encode a special chromophobia that allows the human eye to reflect blue light from light.

Further analysis shows that blue eyes are not only determined by genes, but also related to a series of factors such as population migration, mixed-race marriage, and environment. However, these phenomena have not been extensively studied. At the same time, in the near future, with the development of science and technology, human understanding of genes will continue to deepen, which will also bring many unprecedented new perspectives and unique insights to this topic of general concern.

In conclusion, there is no obvious functional difference in eye color itself, and the emergence of different eye colors stems from long-term changes in genetics and human evolutionary history. However, people's preference and aesthetics of eye color also show that eye color represents the evolution of human aesthetics and cultural concepts to a certain extent, which also reflects our continuous exploration and understanding of the eye as an organ. <>

Foreigners' eyes are blue because the iris pigment content in foreigners' eyes is low, so the eye color is a lighter blue.

Eye color refers to the color of the middle part of the eyeball, which is covered with a layer of iris, which contains many pigment cells, and the amount of melanin in the pigment cells determines the color of the iris. The higher the pigment content, the darker the iris and the darker the eye color; The less pigment you have, the lighter the color of your iris and the lighter your eyes.

The iris is roughly divided into two layers: the front is the iris stroma and the epithelial cell layer that covers it; A layer of epithelial cells on the back of the iris, both of which contain pigments. The color of the iris is related to two pigments.

These two pigments are called melanin and lipopigment. Melanin is black and lipochrome is yellow.

The difference we see in the eyes is mainly reflected in the different colors of the eyeballs. The cornea of the eye has no color, and the color of the eyeball is mainly due to the iris.

This has a lot to do with the difference in people's genes

People in different countries have different eyes, and the color of ** will be different, which may be because of geography and climate, as well as because of diet.

Different races have different genes, so when inherited, the eye color will be different in different countries.

It may be because of the different growth environment, or it may be because of the problems caused by genes, so people in different countries will have different eye colors. For this reason, we must respect people with different colored eyes.

Affected by the environment and climate, due to regional problems, the color of the skin and the color of the eyes are different.

In different countries, people's skin color will be different, and then different skin colors will cause different eye colors, which may be related to geographical location and eating habits.

This has something to do with race and genes, for example, yellow and white people have different eye colors because they belong to different races.

In fact, the main reason is heredity, which should also have a certain relationship with the environment in which you live.

This is the problem of genes and the influence of the living environment.

First of all, the color of the eye actually refers to the color of the iris, and the color of the iris is determined by the amount of melanin. In addition to melanin, light is scattered to form blue, and blood is red, and these colors vary from one color to another, and when mixed, they form a variety of different eye colors.

There are only three primary colors of the human iris: brown, blue, and green. The other colors of the iris are variations of these three colors. People with albinism have a pink iris, which is due to the lack of pigment in the iris and only the color of the microvessels.

For example, dark brown, light brown and gray are all caused by the intensity of melanin, blue is the color produced by scattering, and red is the color produced by albino. When light brown is mixed with blue, it becomes green; Red and blue are mixed to create purple.

Eye color classification:

1.Brown brown is the most common human iris color. The brown iris contains a lot of melanin, and the dark brown iris looks like black. The brown iris is thought to be the dominant gene for the human iris, but recent research suggests that this is not necessarily true.

2.Hazel: The hazel eye is caused by a combination of Rayleigh scattering and moderate levels of melanin in the anterior membrane of the iris. Hazel is difficult to define. They are described as light brown or yellowish brown. Some people think that hazel is an intermediate color between brown and blue iris.

3.Amber and yellow amber are more common in other animals, it is lighter than brown and rarely occurs in humans, and is also known as cat's eye color. In Europe, the proportion is more prevalent, or more mixed-race.

4.The green-green iris is the rarest color. a higher proportion among the Celts, Germanic and Slavic peoples of Europe; Outside of Europe, some Pashtuns and Turks also have green iris. The ancient Kyrgyz too.

5.Gray is considered a variant of the blue iris. It is the second rarest color (after green).

6.Blue iris is more common in Europe, with about 8% of the world's population having a blue iris. More than 80% of Nordic people, such as Icelanders, Finns and Latvians, have blue eyes.

So by foreigners you mean Caucasian people in Europe.

Both Hai and foreigner's eyes are blue.

The pupils are rich in different metallic elements.

Just like the difference in hair color between Easterners and Westerners is the same.

Metal ions are one.

Different colors, NA is yellow, K is purple.