katsekenttään

Katsekenttään is a Finnish term that translates to "field of vision" or "visual field" in English. It refers to the entire area that can be seen by an individual when their eyes are fixed in a single, stationary position. This area encompasses everything within the range of the eyes' peripheral and central vision.

The visual field is not uniform. Central vision, or the foveal area, provides sharp, detailed perception and is responsible for tasks requiring fine discrimination, such as reading or recognizing faces. Peripheral vision, which surrounds the central area, is less detailed but is crucial for detecting motion, sensing large objects, and maintaining spatial awareness. The extent of the visual field can be affected by various factors, including the health of the eyes and the visual pathways in the brain.

Medical professionals use visual field testing, often referred to as perimetry, to assess the integrity of a person's visual field. This testing helps in the diagnosis and monitoring of conditions that can impair vision, such as glaucoma, optic nerve damage, stroke, and neurological disorders. Abnormalities in the visual field can manifest as blind spots (scotomas), reduced sensitivity in certain areas, or a narrowing of the overall visual field. Understanding one's katsekenttään is fundamental to visual perception and navigating the environment.