What is the eye made of? Detailed answer

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What is the eye made of? Detailed answer

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What is the eye made of?

The human eye is a kind of camera. It has a special hole where light rays fall (pupil), lenses that focus them, and a retina where the image appears.

There are about 130 million light-sensitive cells inside the eye. When light hits them, they immediately undergo chemical changes that are converted into a nerve impulse. Through the optic nerve, it enters the part of the brain that is responsible for vision. Here, this signal is processed, after which we see one or another object.

The eye has the shape of an apple with a slightly elongated anterior part, in the middle of which there is a hole, or pupil. It appears black because behind it is the dark interior of the eye. Light through the pupil falls on the lens, which converts the light rays into an image on the wall of the eyeball. Here, like the film of a camera, there is a layer of light-sensitive cells, or the retina.

Around the pupil is the iris. It has the shape of a donut in blue, green or brown. The iris can change its size like the aperture of a camera. In bright light, tiny muscles dilate it, and so the pupil constricts, allowing fewer rays to pass in. In the dark, on the contrary, it expands.

The entire eyeball is covered by a membrane called the sclera. The whites of the eyes are also part of this membrane. From the outside, it is transparent, this part of it is called the cornea. The space between the cornea and the iris is filled with fluid, or "chamber moisture". It acts as a lens.

The other lens of the eye, the lens, can change shape. When we look at close objects, the lens becomes thicker, when we look at distant objects, it becomes thinner.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How many religions are there?

What is religion? The word "religion" can have so many meanings that it is almost impossible to describe them in a few words. But six qualities are inherent in most religions. Let's look at them briefly:

1. Faith in the power or powers of heaven is stronger than faith in the powers of man.

2. These heavenly powers are feared, exalted, they are prayed to, sacrifices are made to them.

3. There are special ceremonies for these sacrifices and prayers.

4. Certain places and objects connected with the cult and the history of religion are declared sacred.

5. There is a belief that by observing the requirements of religion, people can have a better life both on earth and in heaven after their death.

6. Right conduct is the only way for a person to appease the god, or gods, and only it leads a person to a better life.

Most of all the religions of the world are based on these six principles. The religion of primitive people, which includes the worship of the "spirits" of animals, stones, rivers, and so on, is considered primitive. Later, as civilization developed, many religions based on polytheism died. The "dead" religions, for example, include Egyptian, Babylonian, Assyrian, Greek, Roman, as well as Celtic and Scandinavian. But many religions have survived to the present day.

The most famous are Hinduism, Buddhism, Confucianism, Taoism, Shintoism, Zoroastrianism, Mohammedanism, Judaism and Christianity. These religions together have about 2 followers in total, which is the majority of the civilized world. Here are the most common religions:

Hinduism has about 460 followers, most of them live in India.

Buddhism has about 250 followers, predominantly in China and Japan.

Confucianism has about 158 adherents and Taoism has about 000.

Shintoism is practiced by about 32 people, Zoroastrianism by about 000, Mohammedanism is practiced by a total of about 000 in Asia and Africa.

Judaism has about 17 followers.

The Christian religion today has more followers than any other - about 1 people.

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