The human body contains many components that are interconnected. Vision is one of the main organs of perception that allows you to navigate in space. Thanks to him, the brain receives information about the environment, recognizes objects, estimates the distance to them. A pair of eyes are used as sensors; to inspect a larger area, a person can move them synchronously. Moreover, the eyeballs always move in one direction. For example, you cannot turn one to the right and the other to the left. Why is this happening?
How the visual system works
The human visual organ has a complex structure in which the optic nerve and the eyeball are isolated. The movement of the eye is carried out using six muscles located inside the eye opening. They receive signals from the brain using nerve endings.
Eye device.
When light hits an object, it is reflected in space. Light hitting the retina of the eye passes through the lenses and hits special sensors that send signals to the brain. The latter forms the image and recognizes it. Thanks to this, a person can see the environment around him.
Why do the eyes move in sync?
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In order for the brain to always receive a complete and integral picture of what is happening around, both eyeballs move synchronously, complementing each other's images. This allows invisible areas to be located at the edges of the visual boundaries, making it easier to perceive the environment and focus on objects. If a person could open his eyes to the sides, they looked at different objects, an invisible zone appeared in the center, and the brain did not know which point in space to focus on.
To avoid such problems, the eyeballs move synchronously. Movements are carried out by the nervous system, which connects to the eyes through channels located on the inner side of the eye. The organs of vision of most creatures have the same features.
In humans and animals, sometimes the nervous system fails, and the eyes can diverge in different directions. Because of this, squint appears. For example, this defect is widespread among Siamese cats.
Author: Kirill Shevelev