What is the eye?
It is the vision that gives the world so much information,how much can not be obtained by using hearing, taste and olfactory sensations, touch. The eye, despite its small size, is a very powerful "device" with which the lens of even the most high-end lens can not be compared. But how does it work? What is the eye? How is it arranged, what allows us to see the world in such wonderful colors? This will be discussed in our article.
In the textbook of anatomy at school, we are informed thatthe eye is the organ by which humans and animals can see. It is through a fragile eye that a person receives ninety percent of the information from the environment in which he lives. The human eye looks like an irregular ball, called the eyeball. The eye receives light reflected from objects, this light takes over the retina of the eye, which is located on the back of the eyeball. The retina consists of several layers of sensitive cells, they receive information about the appearance of objects, process it and transmit it to the brain through the optic nerve. So we see the objects and distinguish them. Focus the rays of light on the retina helps the lens, in form resembling a biconvex lens. There is a lens on the front of the eyeball. And light rays fall on the lens through the pupil. In bright illumination, the pupils of our eyes become narrower, and when they are dark they dilate. Thus, the pupils protect the eyes from excessive amounts of light or vice versa, when the illumination is bad, they, increasing in size, help the eye to get more light.
Protects the eyeball sclera - proteina shell consisting of fibers. The anterior transparent wall of the sclera is the cornea, in which the primary refraction of the rays occurs. The protein shell is followed by a vascular membrane, it has many capillaries through which blood enters the eye, feeding it. In the choroid are the iris and pupil. Between the cornea and the iris, between the lens and the iris are the chambers of the eye, in which the refracting liquid is contained.
Eyelids and eyelashes serve as eye protection. The eyelids contain tear glands, and the liquid released by them moistens the mucous membrane of the eye. Under the eyelids are three pairs of muscles that help the eyeballs move.
An important role in good eyesight is played by workretina. If the images of objects fall exactly on it, then the eye sees well, if the image is in front of the retina or for it, then the person sees the objects blurred. So there is myopia or hyperopia.
Now you know a little about what the eye is, what it consists of and how it works.