Secrets of the structure of the eye
Sometimes the human eye is compared with the opticalsystem: it has a light-sensing matrix, otherwise the retina, 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 tricky device.
The human eye is protected from the front by the eyelids - the lower andthe upper one. Outside, the person's eyelids are covered with skin, inside - with a conjunctiva, a thin membrane. Eyelids and eyelashes serve as protection from dust and litter in the eyes. Sebaceous glands, which are under the eyelids, contribute to the release of fluid, which constantly moistens the eyeball. Also under the eyelids are muscle and cartilage, due to which we have the opportunity to blink, because the muscles set in motion the eyelids. In the corners of the eyes are tear points, through which a special liquid, called tears, is released. Thanks to tears, we not only drop the burden of accumulated emotions, but also clear our eyes of dust, rinse the eye from the inside, and also remove toxins from the body.
The anatomy of the eye is unique and unrepeatable. In each eyeball there are six muscles, each of which performs its function. The muscles allow us to freely turn our eyes and focus our eyes on a particular point. The mechanism of the structure of the eye is due to the presence in the outer shell of the cornea and sclera. In another way, the eye sclera is called a protein, because it has a white color. It takes 5/6 of the eye's shell and performs a protective function, and also supports 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 presenceround hole - the pupil, which is 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 eye color can be either brown, or blue and green. Through the pupil rays pass, reaching the retina. If the light is bright, the pupil narrows, if the room is dark 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 one more element - the lens. The lens is located in the pupil and serves as a biconvex lens. The cornea and the lens feed on fluid from the eye cells.
One of the important components of the eye isretina. It is a plate consisting of several layers of cells. From the structure of the retina depends on how well a person is able to distinguish objects. Behind the retina is a black substance - melanin, which absorbs incoming light and does not allow it to reflect. Also the amount of melanin determines the color of the eyes. The more melanin the darker the human eye. It happens that people have differently colored eyes. This is indicated by a violation of this pigment.
The structure of the eye is unusual and verya complex phenomenon, a whole mechanism over which scientists for many centuries worked from different countries. In order for a person to see and distinguish different objects, dozens of muscles, nerves and joints are involved. The human eye is a whole system, a whole mechanical device. It's amazing how cunning and exact everything was conceived by nature. Thanks to sight, we learn about the world, we carry out our vital activity and communication. It is difficult to imagine how people do without sight. Therefore, it is necessary to treat your vision with care and care. Do not sit for 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.
