Why do people have two eyes? Why do people have two eyes?

To sum up, we generally only use a flat two-dimensional space, where one eye can determine east, west, north and south, and the other can determine distance.

One is spare, in fact, it is not like this, the two eyes of the person are used to determine the distance between the object and the person, which is calculated by the principle of the size of the angle between the two eyes, if it is an eye, then you can not determine the distance between the object in front of the person and the person.

There are also three-eyed ones. Jiro God. He can tell you why it's three eyes.

All animals have two eyes, and humans are no exception.

And a lot of human bodies are symmetrical!

Your question is so classic!! You deserve the Nobel Prize, go get it.

Or if you apply for the Guinness World Records, don't come here.

The best results of natural evolution.

You can ask the one-eyed deaf, such a person can often only see objects clearly, but cannot distinguish the distance of objects, but with two eyes can determine the distance of objects.

The philosophical truth is that people should see more and listen more and talk less.

Scientific truth, God should ask nature about the creation of things

This is called "** split" is proportional!

It's for the sake of looking good!

Think of your symmetrical eyes with a human mind.

Because both parents were born with two eyes

Have you ever seen an animal with an eye?

01 Our eyes are separated, so the images we see are not exactly the same. After the two eyes transmit the image they see to the brain, and then through the comprehensive analysis of the brain, a three-dimensional image is generated, and the two eyes are separated, and the range that can be seen is large, which is conducive to maintaining balance, so the two eyes are the need for survival competition.

The eyes are the windows of the soul, people can see the world through the eyes, if someone loses their eyes, it is equivalent to losing half of their life. Dear friends, why do people have two eyes?

Because there is a distance between the two eyes, when a person looks at a distant object with both eyes, the line of sight of the two eyes is not parallel, and finally intersects on the object, the distance of the object is different, and the angle of deflection of each eye is also different.

When a person has two identical eyes, and both eyes are used to look at a scene at the same time, the size, shape, and brightness of the image of the scene on the retina of both eyes are the same. However, because the left and right eyes scan the scene from two different positions and angles, and each point of the scene is not exactly the same as the corresponding point on the retina, this creates parallax. Parallax is the signal of depth given to the eye by the external world, and the eye transmits the depth information to the brain, and the brain processes these two two-dimensional plane objects with parallax to synthesize them into a single complete object with depth and three-dimensional sense.

Moreover, when we look at an object with both eyes at the same time, each point on the object has an angle to both eyes. The closer the object is to the eyes, the greater the angle of opening of each point on the eyes, and the greater the parallax displacement. It is this parallax displacement that allows us to distinguish between the distance and proximity of objects and to achieve a deep three-dimensional feeling.

For objects far away from us, the sight of the two eyes is almost parallel, and the parallax displacement is close to zero, so it is difficult for us to judge the distance of the object, let alone have a three-dimensional perception of it.

In the dark night, when we look up at the starry sky, we will feel that all the stars in the sky seem to be on the same sphere, and we cannot tell the difference between far and near, which is the result of zero parallax displacement. Of course, if there is only one eye, there is no dislocation of parallax, and the result is that it is impossible to produce a three-dimensional effect. For example, if you close one eye and do the delicate work of threading a needle, it will often look as if the thread has passed through the pinhole, but in fact it has passed through the edge and has not been threaded.

Categories: Medical & Health >> ENT.

Why is this so?

Because there is a distance between the two eyes, when a person looks at a distant object with his eyes, the line of sight of the two eyes is not parallel, and finally intersects on the object, the distance of the object is different, and the angle of deflection of each eye is also different (it can be considered that the two bottom corners of the human eye are an isosceles triangle, and their connecting lines are rolled into the bottom edge of this triangle, and the length of the bottom edge is unchanged, because the spacing between the eyes will not change, and the object of the person is the top angle of the triangle, and the object is far away from the person, The waist of the isosceles triangle is longer, and at the same time, its base angle is also larger, when the object is infinitely far away, the base angle is infinitely close to 90 degrees, this angle is what I call the angle of human eye deflection).

In the process of human evolution, the brain has evolved the ability to perceive the angle of deflection of the human eye (although you can perceive the degree of the human eye, but your brain does observe its size), and the brain can determine the distance of the target object through the magnitude of the angle of the deflection of the human eye (because, the isosceles triangle we already know a bottom, 2 angles, and triangles can be solved).

It's all natural, you can't feel it at all, but it does exist, and what you receive is just the result of brain calculations, and you can know at once which of the two objects is far and which is close! But it doesn't have a numerical value, and the brain is not a rangefinder!

Summary. My dear, the two eyes refer to: two organs that can perceive light. The simplest eye structures can detect the light and darkness of the surrounding environment, and the more complex eye structures can provide vision.

My dear, two eyes are two organs that can sense light. In the simplest way, the eye structure can detect the light and shade of the surrounding environment, and the more complex eye structure can provide vision.

Eye-specifics: In many vertebrate jujube mimics and some mollusks, the eye projects light onto the light-sensitive retinal imaging of the limb, where light is received and converted into signals and transmitted to the brain through the optic nerve. Usually the eye is spherical, filled with a clear, gel-like substance, with a lens for focusing, and usually an iris that controls how much light enters the eye.

It has been said that God gave us two ears and one mouth to listen more and talk less, and this is true! Don't believe me, let's take a look at the following example:

There is a company boss parent-child interview, each guy and girl waiting outside with the speech in their hands keep talking, repeating repeatedly, the boss sits on the bench skillfully looking at the resumes sent one by one, his face is expressionless, he doesn't say a word for a long time, and even an employee's speech has been finished, and the boss seems to be still looking at the window in a daze.

The boss's godless gaze turned in the crowd, until a young man with coffee stopped, only to see that the guy was very calm, there was nothing in his hand, the boss immediately asked the secretary to let the guy come in first, the guy came in and didn't say anything, looked at the boss calmly, then the boss opened his mouth: "Don't you introduce yourself?" The guy shook his head calmly and said:

It is already indicated on the resume. "Then what you're here for..."Standing here is my purpose," the guy smiled calmly. The boss's godless eyes brightened, and he gave him a few reports:

Sent to various departments. "Okay, boss. "Don't you even ask me why I asked you to do this?

Could it be that I. Aren't you already at work? The boss looked at the back of the guy leaving and smiled with satisfaction.

Later, someone asked him why he didn't introduce his ideas in the first place. He said, "Can't you see? The boss doesn't want to listen (nonsense), he just wants to have prepared and powerful employees....”

Through this small example, we can know that what you say is never as good as what you see, look at the world you think, the people you care about...

It's better to see and listen than to talk....