The visual organs we have are involved in the central nervous system, but like other organisms, they are the result of evolution, and the most prominent in our vision are advanced visual functions such as binocular vision, stereoscopic vision and visual psychology, which are the peak of the evolution of animal visual functions, and the result of long-term labor, long-term adaptation and continuous evolution of human beings in the environment.
In daily life, most of us use both eyes to see at the same time, when the eyes are parallel to the front of the distance to view, although the object being viewed at the same time on the eye separately, but do not feel that there are two objects, this is due to the cerebral cortex of the visual center of the fusion of these two objects overlapped into a complete and three-dimensional sense of a single object.
And many animals because the eyes are located on both sides of the head, although there is a wider range of vision, but most of them do not have the function of binocular monovision, and we can look at an object, and at the same time, because there is a certain distance between the two eyes, so that the position of the viewing object is not exactly the same, so that there is a small difference in the image of the object, this has a small difference in the two objects transmitted to the brain, after the fusion of the image to produce three-dimensional vision, this advanced function makes us engage in fine operations handy.
Finally, if we don't have eyes, then we can't appreciate this colorful world, so we must protect our eyes and avoid making them myopic and other complications.