Nägemisväljas

Nägemisväljas refers to the field of vision, the entire area that can be perceived by the eye at any given moment without moving the head or eyes. It is typically measured in degrees. A healthy human eye has a horizontal field of vision of approximately 150-160 degrees and a vertical field of vision of about 135 degrees. This field of vision is not uniform; the central part, known as the foveal vision or sharp vision, allows for detailed perception, while the peripheral vision provides a broader, less detailed awareness of the surroundings.

The field of vision can be affected by various factors. Certain medical conditions, such as glaucoma, retinitis pigmentosa, or strokes, can cause blind spots or a reduction in the field of vision. Age can also lead to a gradual narrowing of the visual field. Medications and exposure to certain toxins can also impact it.

Testing the field of vision, or perimetry, is a common diagnostic procedure used by ophthalmologists and optometrists to detect and monitor vision loss. It helps in diagnosing and managing eye diseases and neurological conditions. Specialized instruments are used to map the extent and sensitivity of a person's visual field. Understanding one's nägemisväljas is crucial for everyday activities like driving, reading, and navigating the environment.