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How does the eye see?

One of the most unique and necessary organs is vision. With it, we learn more than 90% of the information received from outside. If we consider how one sees the human eye, then one can notice that its structure most closely resembles the camera in structure. However, it would be more correct to say that the camera was invented by analogy with the structure of the eye.

The principle of "work" eyes

The eye itself is located in the fossa, which is called the eye socket. The shape of the eye is more like an apple, which is why the name “eyeball” has spread. Through the gap between the lower and upper eyelids, the orbit looks out a little, but most of the eye is inside. Inside the eye is a small black circle, which is called the pupil. Scientists have shown that when in the dark for a long time, the pupil expands, and getting into bright light, on the contrary, narrows. By analogy with this, the camera aperture works: in bright light it narrows and in dim light it expands.

This happens with the assistance of the muscle inside the eye, on the iris.If you do not know what the iris is, then we hasten to inform you that this is a small colored ring that is located around the entire pupil. The black color of the pupil is explained by the fact that there is always a void inside the eye. Behind, as well as in the film of the camera, there are several photosensitive cells. This layer, like a network, catches the rays of light. The name of this layer of cells is retina. Inside it there are at least 140 million cells that are extremely sensitive to light. When light enters, various chemical reactions begin to occur inside them, instantly turning into a pulse. Moving along the optic nerve, this impulse hits the very center of the brain. Then the brain produces a signal and only after that we begin to understand what we see. Thus, we have just described how one sees the human eye.

Eye structure

The lens is fully responsible for image clarity. If to compare with the camera, then it can be noted that the lens plays the role of the lens in it. Similar to the lens, our lens is convex and two-sided. But, unlike the glass analogue, the present has a soft shell.The lens is needed in order to collect the rays, and then direct them to the retina. In order to focus the rays from a thing that is far away, the lens must be flatter, and if it is necessary to focus on the nearest object, it will again become thicker. For this is responsible a special muscle, which is located around the lens. When it shrinks, the lens becomes thicker; when it expands, it becomes thinner. If you need to look at objects at different distances, then we will need to use completely different curvature of the lens.

If we talk about the structure of the eye, then it can be noted that the two most important components of the eye are the visual pathways and the brain region that is responsible for analyzing the information received. Thus, each of us looks through the eyes, and sees through the brain.

The appearance of the eye

If we look at the eye from the side, we can see that there are eyelids, the white part of the eye, which is otherwise called the sclera, eyelashes, the inner corner of the eye, the transparent mucous membrane, called the conjunctiva, the cornea.The place where the sclera enters the cornea is called the limbus. Usually, the eyeball is never the right shape, and in size it is at least 23-24 mm.

The eyes are located in a special inert repository, the so-called eye sockets. From the outside, they have reliable protection provided by the eyelids, and at the edges they have oculomotor muscles, as well as fatty tissue. Inside the eye connects with the optic nerve and through a special channel enters the skull, where the information received by the eye is transmitted to the brain.

The eyelids are usually covered with skin from the outside, and from the inside with a special mucous membrane. They have an important role in determining where the space is visible to the eye. With their help, the boundary of sight is determined. Inside the eyelids there is muscle and cartilage, as well as glands. It is from them that tears arise when we experience the most touching moments. Eyelashes grow on top, which also serve to protect the eyes from various secretions. The eye slit is located between the very edges of the eyelids. If you look more closely at your eye, you can see that inside the eye there is a hole through which tears fall into the nasal cavity.

Thus, the eye is a very complex natural structure that allows you to see and respond to what you see. To understand why he sees the eye, you can only understand with its anatomy and see that its structure is similar to a camera.

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