Originating in the Latin term viso, the concept of view lets describe the sense which gives different organizations the possibility of detect the light and recognize places, people and objects (that is, it enables see ). The vision, in itself, is a capacity that the animals (among them, the human being) from its ocular structure. In the case of certain machinery or devices that mimic this achievement, talk about artificial vision .
He visual system different mechanisms are put in place to make the vision possible. In principle, it assumes the task of interpreting the stimulus received to form from it the corresponding optical image in the retina, through the cornea and lens of each eye. This part of the visual process is in charge of optical system .
Specifically, we can state that within what the optical system is, it is necessary to highlight the fundamental role played by various elements of the eye. Among them are the cornea, aqueous humor, iris, lens and, of course, the retina.
This vital part of the eye is the last one that can be affected by a series of diseases of more or less importance. Thus, among them it is necessary to emphasize those known as floating bodies that are spots in the field of vision, retinal detachment, the macular hole or macular degeneration.
On the other hand, the cells that are located in the retina constitute the so-called sensory system of the ocular organ . Here the photoreceptors intervene, which are responsible for capturing the luminosity that reaches them. According to experts, there are two kinds of photoreceptors: some that are known as cones and others that define rods.
Other types of cells are also involved in this stage, responsible for converting light into impulses of electrochemical character and lead them to the optic nerve . Once there, they are transmitted to different areas, among which the area of the lateral geniculate nucleus and the visual cortex of the brain can be mentioned.
The process of reconstruction of distances, the recognition of colors, movements and shapes of objects, finally, takes place in the brain .
It should be noted that the dictionary of the Royal Spanish Academy (RAE) he attributes many other meanings to the concept of vision, such as describing direct contemplation without a sensitive perception; to name an opinion that an individual may have on a specific issue or problem; that of being related to the consideration as true and real of a fantasy or illusion; and to represent an image that, in a supernatural way, can be seen through sight or through a recreation of something imaginary.
Taking these meanings into account, some of the examples that may work to explain everything we have underlined would be the following: “The young man had a spooky vision while sleeping in the abandoned mansion” or “The medium has had a vision of what could have happened to him to the missing boy. "
In the same way it should be stressed that these types of visions also occur in certain people who are sick. Specifically, they suffer those who are living a moment of psychosis, that is, those who for some specific circumstance are passing a mental state that moves them away from reality.
Patients cited who will not only have those visions, both auditory and visual, but also suffer from sudden changes in behavior, loss of memory, depression, and feelings that people observe them and even that they are plotting something against he.
Finally, we can mention the businesswoman vision , a component of the planning process of a company .