Why does a person have two eyes

Have you ever wondered why you have two whole eyes? Some representatives of the animal world calmly manage with one, but many others, including humans, were destined to become the owner of two whole eyes. And both eyes are located in the same area, at the same level, have the same color and almost identical shape. The eyes of a person, as the writers beautifully say, are the mirror of his soul. We fall in love with the eyes, we remember the eyes, and it is the look of another person that can cause very strong emotions within us. But still, all these things theoretically could be done by one eye, why do we have two of them? Estet-portal.com has found the right answer for this question for you.

Why  a person needs two eyes    

Before understanding why a person needs two eyes, it is important to understand what function this paired organ performs in our body. Even a small child knows that we need eyes in order to see. In medical terminology, the eyes perform the functions of light and color perception, central and peripheral vision, as well as stereoscopic vision, which will be discussed in more detail later. Thanks to all these functions, a person is able to navigate in the world around him, protecting himself from the effects of factors dangerous to his life. It is vision that helps us quickly identify an impending danger, assess its size, speed of approach and other characteristics, and then avoid it as efficiently as possible.

Two eyes:

• why do we have two eyes, and they are located on the face;
• how two eyes help form a three-dimensional image.

Why do we have two eyes, and are they located on the face

Why are the eyes – is it a paired organ? It would seem that having, for example, one large eye on a stem above the head, which could turn 360 °, & nbsp; would be much more practical, because a person would not have to turn his head or his whole body to see what is happening behind him. But two eyes are located together on the face for a reason. It is thanks to this arrangement of the eyes that a person has a fairly wide field of view, and at the same time is able to distinguish small details, for example, not only to see the eye of a needle, but also to easily thread a thread into it. With too wide a view, the eye apparatus would be poorly adapted for viewing details. And the location of the eyes in the eye sockets is explained by the need for their maximum protection, because one eye above the head or in the forehead would be very vulnerable to various kinds of damage.

How two eyes help form a three-dimensional image

As you know, human eyes can perceive the objects of the surrounding world as three-dimensional, estimating their size, shape and location. Only two eyes can provide stereoscopic vision – the ability to perceive objects in the "3D-format". This is explained as follows:

the retina is divided in the middle so that the nerve fibers located on the outside of the eye connect it to the corresponding hemisphere of the brain, and the nerve fibers from the side of the nose lead to the opposite hemisphere;
nerves leading to the hemisphere on which the eye is located are responsible for stereoscopic vision;
the picture that hits the retina of each eye is slightly different;
there are cells in the brain that combine the images from each eye into one to create the most accurate 3D image.

Thus, it is precisely due to the fact that a person has two eyes that a feeling of the depth of space is formed, and  we can perceive objects as three-dimensional images. Imagine that all objects in the world around us would be perceived by us as flat, like images on a TV set. Two eyes – this is a valuable gift of nature, thanks to which the world is perceived by a person in much more detail and more interesting.