How do people see?

Nadezhda Manko
Nadezhda Manko
March 15, 2013
How do people see?

Over 70% of information is perceived by a person through vision. He sees everything that surrounds him and then he remembers all this. A person can see with the help of such an organ of the body as the eye. The article will look at how people see with the help of the eye, or rather what is happening in the eye and how the picture turns into nervous impulses.

Eye device

The main organ of vision is the eye. It is a spherical body. On top of it is covered with a special shell, which has a white color. In front of the eye, this shell is transparent and is called the cornea. Under the outer shell is the second layer of the eye, consisting of blood vessels. Then another layer that consists of nerve endings. Here are the receptors of view: cones and rods. Receptors cones provide a person the perception of light and darkness, and the sticks allow you to perceive color. The number of the latter in the retina is very large.

The eye consists of two chambers. The first starts from the cornea. There is a lens in this chamber, and muscles that can move this lens and affect its elasticity. Next, behind the first camera, is the second camera.It is surrounded by the three above-mentioned shells, and is filled with a vitreous body.

How does the eye perceive the environment

Consider how people see. All objects that surround us create certain rays with different frequencies. These rays enter the eye through the cornea. Then they are refracted in the lens and focused on the retina. Retinal receptors perceive these rays and transmit nerve impulses to the brain. There, all the information is processed and an image of the seen is created - the image that surrounds us.

The human eye can perceive rays (electromagnetic waves), which have a length of from 400 to 750 nanometers. Waves with a smaller length (ultraviolet) and with a longer length (infrared) the human eye does not perceive. It is worth noting that the lens is a very important organ of the eye. It has a biconvex shape. With this form, it focuses the waves on the retina. When these waves are focused in front of the retina, or behind it, then the person can no longer see all the details of the object from which the rays come.

Now you know how to see the human eye.There is another very interesting fact related to the optical properties of lenses. All biconvex lenses focus rays upside down. That is, a mini-image of any object on the retina turns upside down. But this is eliminated by the work of the brain, while processing nerve impulses.


Date: 08.10.2018, 22:13 / Views: 94295

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