Sometimes the human eye is compared with the optical system: it has a light-reflecting matrix, otherwise the retina, the diaphragm, that is, the pupil, the lens, that is, the lens, and the biological body, the sclera. Consider the secrets of the structure of the eye in more detail to understand its cunning device.
The human eye in front has been protected for centuries - lower and upper. Outside, the eyelids of a person are covered with skin, inside - a conjunctival, thin shell. Eyelids and eyelashes protect against dust and litter in the eyes. The sebaceous glands located under the eyelids contribute to the release of fluid, which constantly moisturizes the eyeball. Also under the eyelids are muscles and cartilage, thanks to which we have the opportunity to blink, as the muscles move the eyelids. Lacrimal openings are located in the corners of the eyes, through which a special fluid called tears is released. Thanks to tears, we not only dump the load of accumulated emotions, but also clear our eyes of dust particles, rinse our eyes from the inside, and also remove toxins from the body.
The anatomy of the eye is unique. Each eyeball has six muscles, each of which performs its function. Muscles allow us to freely turn our eyes and focus our eyes on a specific point. The mechanism of the eye structure is due to the presence in the outer membrane of the cornea and sclera. In another way, the sclera of the eye is called a protein, because it has a white color. It occupies 5/6 of the eye shell and performs a protective function, and also maintains the shape of the eye. The cornea of the eye is transparent and has a convex shape. The main function of the cornea is the refraction of light.
The mechanism of the structure of the eye is characterized by the presence of a round hole - the pupil, which is located in the center of the iris. By the way, the pigment of the iris determines the color of our eyes. Depending on the pigments, the color of the eyes can be either brown or blue and green. Rays reaching the retina pass through the pupil. If the light is bright, the pupil narrows; if it is dark in the room, it expands. The size of the pupil indicates how much the person strains his eyesight to focus on objects. And in the dark it is much more difficult to do. The structure of the human eye is due to the presence of another element - the lens. The lens is located in the pupil and acts as a biconvex lens. The cornea and lens are fed by fluid from the chambers of the eye.
One of the important components of the eye is the retina. It is a plate consisting of several layers of cells. How well a person is able to distinguish objects depends on the structure of the retina. Behind the retina is a black substance - melanin, which absorbs incoming light and does not allow it to be reflected. Also, the amount of melanin determines the color of the eyes. The more melanin, the darker the human eye. It happens that people have eyes of different colors. This is indicated by a violation of this pigment.
The structure of the eye structure is an unusual and very complex phenomenon, a whole mechanism over which scientists from different countries have worked for many centuries. In order for a person to see and distinguish between various objects, dozens of muscles, nerves and joints are involved. The human eye is a whole system, a whole mechanical device. It is amazing how cunningly and precisely everything was conceived by nature. Thanks to vision, we learn about the world, carry out our life activities and communication. It is hard to imagine how people go without sight. Therefore, you need to pay attention and care to your vision. Do not sit for long hours in front of a computer, read a lot and strain your eyes. The human eye, like the body as a whole, requires rest. Therefore, do not forget to get enough sleep, do gymnastics for the eyes so that they remain healthy and vigilant.