Vision is one of the most important processes in the perception of the world around us.
A lot of functions are involved in the visual apparatus.
One of them is peripheral vision.
General information about peripheral vision
Peripheral vision is one of the componentsParts of the visual apparatus that is responsible for the boundaries of the field of vision when projecting them onto a spherical surface. In this case, the field of view is a kind of space that is perceived by the eye only in a stationary state. The visual field is one of the functions of the peripheral parts of the retina, which determines the person's ability to easily navigate in space.
The main indicator of the productivity of peripheral vision is the viewing angle of a person.
As for the field of view, it hasSpecific values that determine the border of the retina. So, for example, the white color of the eye reacts only at an angle of 90? - Outside the retina, 70? - up to the outside, 55? - up inside, 55? - Inside, 50? Down to the bottom, 65? - Down, 90? Down to the outside.
A "blind spot" is one of thesePhysiological cattle, which is located in the temporal field of view. Along with physiological scotomas, there are also angioscotomes (ribbon-like "prolapses" that arise from enlarged reticular vessels that close the photoreceptor cells), but they only slightly worsen peripheral vision and are considered the norm.
Those areas that fall out of sight are called "scotoma".
The scotoma is divided into three types:
Positive scotomas can be recognizedIndependently in the form of black spots in the field of view. They are the first sign of damage to the retina. Negative scotomas can be identified only by examination. The reason for the occurrence of such cattle is damage to the conductive paths.
Atrial scotomas appear spontaneously. Basically, they arise because of spasms of the vessels of the brain. In case, if you close your eyes, a person sees zigzag colored lines outside the peripheral vision, specialists recommend immediately starting the use of antispasmodics.
List of problems contributing to worsening of peripheral vision
Impairment of peripheral vision is facilitated by the following vision problems:
1. The initial stages of tumors and inflammations. With such diseases can be lost? Part of the field of view.
2. Various pathologies of the retina. Depending on this vision can deteriorate in different areas. For example, glaucoma helps to narrow the field of vision in the nose.
3. Nerve damage and retinal dystrophy. This problem leads to a narrowing of the field of view from all sides to 5-10 ?, this phenomenon is called concentric narrowing of the field of view. With this disease a person can see and read, but loses all the ability to independently navigate in space.
In any case, at leastThe slightest hint of worsening peripheral vision should be consulted with specialists. Having carried out the necessary examinations, they will put the correct diagnosis and help you to keep your eyesight.