nägemisnurgas

Nägemisnurgas refers to the field of vision, the extent of the area of space that can be seen at any given moment without moving the head or the eyes. It is typically measured in degrees. A person's field of vision is divided into several parts, including the temporal field (towards the temple), nasal field (towards the nose), superior field (upwards), and inferior field (downwards).

The horizontal field of vision for a human is approximately 180 degrees, with each eye contributing to this. The vertical field of vision is generally around 135 degrees. Peripheral vision, which is the part of vision that occurs outside the direct line of sight, plays a crucial role in detecting motion and providing spatial awareness. Central vision, on the other hand, is responsible for sharp, detailed sight, essential for tasks like reading and recognizing faces.

Conditions affecting the eyes or the brain can impact the field of vision. For instance, glaucoma can cause peripheral vision loss, often described as tunnel vision. Similarly, damage to the optic nerve or specific areas of the brain can lead to scotomas, which are blind spots within the field of vision. Ophthalmologists often use perimetry tests to map a patient's visual field and detect any abnormalities. Understanding one's nägemisnurgas is important for daily activities and for diagnosing various visual impairments.