The human eye, the structure of which we will consider in the framework of this article, is not in vain compared with the mirror of the soul! Millions of odes, poems, and legends have long been composed of their beauty. From century to century, the eyes are considered inextricably linked with the soul of man. Even the most respected scientists, who know firsthand what our eyesight is, do not cease to be surprised to this day, calling this mechanism a real miracle of nature!
Human eye. Structure
Our eyes are very often compared with a camera. And indeed: here there is a casing (cornea), and a lens (its lens), and a diaphragm (iris), and even a photosensitive film (retina). The structure of the human eye , the drawing of which is attached, tells us the following.
Outwardly, our eyeball has an irregular ball shape. It is securely hidden in the corresponding eye sockets of the skull. The organ itself consists of auxiliary components (lacrimal organs, eyelids, conjunctiva, oculomotor muscles) and the so-called optical apparatus (aqueous humor, cornea, vitreous humor, crystalline lens, posterior and anterior chambers).
The human eye, the structure of which is of the most complicated nature, is covered by the lower and upper eyelids in front. Outside, they are covered with skin, and inside - by the conjunctiva (the thinnest wet shell). It is worth noting that it is the eyelids that contain special lacrimal glands to moisturize the mucous membrane of the eye.
The outer shell of the eye
It is composed of the so-called sclera (eye protein), the front of which is visible through a transparent conjunctiva. The sclera passes into the cornea, without which no human eye can exist.
The structure of the cornea
This is the most convex part of our visual organ. Figuratively speaking, this is our "lens", our window into the world of visual feelings!
Iris
This is a kind of diaphragm located behind the transparent cornea. Outwardly, this is a thin film that has a certain color (brown, gray, blue, green, etc.).
Pupil
At its center is a round black hole. This is the pupil. It is through it that all the rays that fall on the retina pass. In the area of the pupil is the lens. This is a kind of biconvex lens, which takes an active part in the accommodation of the eye.
The structure of the retina of the human eye
In essence, it very much resembles our brain. Speaking figuratively, this is a kind of window into the brain. Outwardly, it resembles a plate consisting of 10 layers of cells. The retina is transparent. Of course, its most important layer is photoreceptors, which include the so-called cones and rods.
The cones are responsible for the visual acuity of the distance, and the rods provide peripherals. It is worth noting that both cones and rods are on the back of the retina. Therefore, the light that comes from the outside must pass through other layers that stimulate them.
And finally
The structure of our eyes is so complex, and the body is so fragile and tender that the visual process itself is nothing more than a real miracle!