Line of sight

Introduction.

Field of view is a concept that refers to the human visual apparatus and determines its ability to perceive objects in the environment. It depends on many factors, such as viewing angle, visual acuity, eye adaptation, etc. In this article we will look at the theoretical foundations of the visual field and its practical significance in our daily life. Description of field of view. Definition. **Field of view** - *is a limited part of the surrounding space that a person can see without moving the eyes*. It is determined by two factors: the angle of perception and distance. The perceptual angle is the angle that the fixation point (the point at which the eye stops) makes with the center of the eye. Distance is the distance between the fixation point and the object in question. Principles of normal visual field. The normal field of view is about 180 degrees horizontally and 160 degrees vertically. It is divided into nine areas called fields of view. Each field of vision has its own angle and zone of the fovea - the area where visual acuity is maximum. The most important area of ​​the visual field is the fovea, as it gives the most accurate idea of ​​the color, shape and size of objects. Description of visual field distortion depending on various factors. * **Ametropia**. Ametropia is a disorder of the optical ability of the eye, due to which a person cannot accurately see objects located at a distance. With farsightedness and myopia, the field of vision expands due to the fact that the shape of the eye and the refractive medium differ from the norm. * **Age**. With age, a person loses the ability to see small details in the field of vision, but at the same time he is able to better distinguish colors and recognize objects. This occurs due to the loss of neuronal elements in the retina. * **Emotional condition**. Anxiety and stress can cause a narrowing of the visual field, as this is associated with activation of the sympathetic nervous system. This phenomenon is also observed in smokers, since tobacco smoke disrupts the proper formation of nerve fibers in the retina of the eyes. * **Stress and hunger**. Stress can impair the ability to perceive colors in your visual field. Fasting and other factors can also affect color perception