Nägemisväli

Nägemisväli refers to the entire area that can be seen by the eye when it is fixed in one spot. It encompasses both the central vision, which is sharp and detailed, and the peripheral vision, which is less detailed but crucial for detecting movement and overall spatial awareness. The field of vision is not uniform; it is typically largest horizontally and narrower vertically.

The extent of the nägemisväli can be measured in degrees. A healthy human eye typically has a horizontal visual field of about 180 degrees, with each eye contributing to this. The vertical visual field is usually around 135 degrees. When both eyes are used together, this creates binocular vision, which extends the field of vision and provides depth perception.

Several factors can affect a person's nägemisväli. Age, certain medical conditions such as glaucoma, stroke, or neurological disorders, and even the presence of cataracts can reduce or alter the visual field. Loss of peripheral vision, often described as tunnel vision, is a common symptom of certain conditions. A doctor can assess the nägemisväli using specialized tests called visual field tests or perimetry. Understanding one's nägemisväli is important for everyday tasks, from navigating environments safely to recognizing potential hazards.