I wonder why Asians and Europeans have different eye colors

Most Oriental eyes are black, while some have black and brown eyes.

Look at your eyes with a mirror, there is a small dark hole in the black eyeball, which is the pupil mouth. Around this pupil, there is a thin film with fine wrinkles, called iridescent (i.e., iris). The difference in eye color is mainly due to the different colors of the iridescent.

The rabbit's eyes are red, and that's because its iridescent color is red. But the rabbit's pupils still look black.

The color of the iridescent color will vary from person to person, and that is due to the difference in the amount of melanin contained in the iridescent. Melanin itself is brown, but if it contains a large amount, it will appear pitch black; If the amount is small, it will appear brown or blue. Not only the iridescence and the surrounding membrane contain melanin, but also the omentum located on the inside of the eye.

The amount of melanin contained in this omentum is almost not different depending on the race. Westerners' iridescence and the surrounding membranes contain very little melanin, so the omentum on the inside of the eye looks transparent, and the result is tea, blue, golden, and other colors.

Iridescent and the membrane around it have the function of blocking harmful light from running through places other than the pupil. Oriental eyes are less afraid of strong light than Westerners because these parts contain more melanin.

Genetic. It is the color of the iris that is different.

God is blue-eyed, Nuwa is black-eyed.

Just like the color of people, the color of the eyes is different for different races. For example, the common eye color of Asians is brown or brown, and Caucasian people have blue or green eyes, why do different people have different eye colors? Our eyeball is divided into the eyeball wall and its contents, of which the eyeball wall is divided into three layers, the outermost layer is the fibrous membrane, which is divided into the cornea and sclera; The innermost layer isRetinaThe middle layer is the uvea, and the part of the eye that we see that is different colors is in the uveaIris

There is a round hole in the middle of the iris, called the pupil, the light is the pupil into the eyeball, in order to better make the object appear more clearly on the macula of the fundus, the inside of the eye is like a dark box, so the pupil looks generally black and gray. The iris has ample melanin.

Somatic cells and capillaries.

The color of the iris is determined by the amount of melanin in the melanosome cells, the more melanin, the heavier the color of the iris, and the less melanin, the lighter the color of the iris.

The common iris colors are dark red, light brown, gray and white, dark blue, emerald green, etc., and the iris colors of different races are different. Generally Asians and blacks.

The common dark red, light brown, and grayish-white iris are all caused by different melanin content. The dark blue or emerald green iris is due to the fact that the iris does not have a lot of melanin, the color is light, coupled with the transmission of light and the adjustment of the color of the capillaries, so it shows dark blue or emerald green, and the key distribution range of the iris of this color is the white race in Europe.

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If it is albinism.

If there is no melanin in the iris, the iris will show the color of capillaries, showing a pale pink color. The color of the iris is determined by the concentration of melanin, and the amount of melanin is genetically manipulated, so it is very likely that the color of the eyes of different races, and different people of the same race, will be different.

The genetics are different in each place, and the development and appearance of ancestors are different in each place. That's why this happens, and there are a total of 4 races in the world, which are black, brown, and white and yellow. So people look different in each place, and the number of times is different.

Because our living habits and diets are different, and there will be a big gap between the geography and geographical location, there is also a big gap between the genes of Europeans and Asians, which is the same as ours, different people have different ** and pupil color.

It's about genes. It is also related to the melanocytes in the iris, which determines the color of the pupil.

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

The main reason is the problem of primitive genes, the original genes are different at the beginning, and the genetic factors are different for different races, so the eye color of Eastern and Western people is different, and even the hair is different.

Because the pigment in the iris in their eyeballs is different, we Oriental people have a higher pigment content, so the eyes are usually black, while Westerners have lower pigment, so the eyes usually have different colors.

Oriental people are people of color, and the pigment content in their eyes is relatively high, and they look very eyed, while Westerners are white people, and there is relatively little pigment in the iris, so it will seem that the color of the eyeballs is much lighter, and they will show different colors.

The eye color of people from the East and the West.

Black. It can be said that the eye color of Asians is black, which can be said to be common sense. There are also people with slightly lighter eyes, but they are basically black and brownish in general.

However, some actresses in the entertainment industry have very light eyes, and they look like they are wearing contact lenses. But this natural color of the eyes is really envious of the dead. The more representative one is Hashimoto Kanna, Hashimoto Kanna's pupil color is light brown, and she looks very innocent and non-aggressive, so the Japanese are dressed sweetly, and it is simply a loss of Moe Ye Zen to everyone.

The most populous country in Asia is China, followed by India. With an average of more than 4,400 people per square kilometre, Singapore is the most densely populated country in Asia. The least densely populated country is Mongolia, with an average of just over one person per square kilometer; Saudi Arabia, Oman and other countries have an average of 5-7 people per square kilometer.

The racial and ethnic composition of the continent is very complex, especially in South Asia. The yellow race (also known as the Mongolian race) is the main race. The rest are Caucasian, brown and a mixture of races.

Topography of Asia:

The terrain of Asia is very undulating, with high in the middle and low in all directions. In the east, there is a longitudinal arc of festo-colored islands. With an average altitude of about 950 meters, it is the highest continent in the world except for Antarctica.

Mountains, plateaus and hills account for about 3 4 of the total area, of which 1 3 are above 1000 meters above sea level. The world's highest peaks above 8,000 meters above sea level are all distributed in the Karakoram and Himalayas. The plains occupy a total area of 1 4, totaling more than 10 million square kilometers.

The continent is roughly centered on the Pamirs, with a series of tall mountain ranges radiating in all directions to the continental margin.

The main ones are the Tien Shan Mountains, the Kunsong Chenlun Mountains, the Himalayas, the Altai Mountains, the Hindu Kush Mountains, the Alborz Mountains, the Taurus Mountains and the Zagros Mountains. Between the above main mountain ranges, there are the Qinghai-Tibet Plateau, the Mongolian Plateau, the Iranian Plateau, the Anatolian Plateau, the Deccan Plateau, the Arabian Plateau, the Central Siberian Plateau, the Tarim Basin, the Junggar Basin, the Qaidam Basin, etc. <>

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

Europeans are white people, and the iris pants have little pigment content, and there are blood vessels distributed in the stromal layer, so the eyes look light blue.

The color of the eye is determined by the amount of melanin on the iris, which is actually a dark brown color, and when the concentration of melanin is high, it will look black. The ability to absorb light varies depending on the intensity of black. Just like people of all races have freckles on their faces, this is the accumulation of melanin in a small area, which shows a darker color than the surroundings.

Summary. Because the iris of animals contains a large amount of melanin, the eyes will appear brown. As the amount of melanin decreases, the eyes appear hazel, green, or blue.

Dear, I am honored to serve you to answer, according to your question, the answer is as follows: because the lead orange eyeball is composed of cornea, iris, and pupil. The cornea is colorless and transparent, and the pupil is not discolored, so it can be seen, and the color of the eye depends mainly on the color of the iris.

It is important to make the pigment content of the cells consistent with the ** color, and it is also related to racial genetics.

Because of their genetics and genetic problems, as well as geographical location, they have a single eye.

So why do animals have more eye color than humans?

Because the iris of animals contains a large amount of melanin, the eyes will appear brown. As the melanin content decreases, the orange will take on a faint brown color, green or blue.

Even the skin color is single.

That's where the genetic problem comes in.

The genetic diversity of all humans may be lower than that of a dog.

Dear, this kind of is a problem of biological research.

Be. This is a long period of knowledge.

1. Oriental eyes are mostly black and brown, while Westerners have many kinds of eye colors, most of which are light colors, like turquoise. In fact, this is determined by the iris of the eye, which is made up of 5 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 5 layers of tissue, the stromal layer, anterior boundary membrane, and posterior epithelial layer contain many pigment cells. The amount of pigment contained in these cells determines the color of the iris.

2. The more pigment contained in the pigment cells, the darker the color of the iris and the darker the color of the eyes; 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 the color of ** and is related to ethnicity genetics.

3. Orientals are people of color, and the iris has a lot of pigment content, so it is weak, and 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.