Visual Field: Calculate Size
Calculator for the size of the visual field at a certain distance. The visual field of an adult human has an average size of 214 degrees in width and 140 degrees in height, these values differ individually. The angles can be converted to lengths for a distance. Please enter a distance, the dimensions of the visual field in the same unit (e.g. meters or miles) will be calculated.
The formula for the calculation is:
Example: at a distance of 2 kilometers, about 13 kilometers in width and 11 kilometers in height can be overlooked. Accordingly, at a distance of two meters, the visual field is 13 meters wide and 11 meters high.
The average angles for the field of vision given above result in a ratio of approximately 3 to 2. This means that we see about 50 percent more in width than in height. The reason for this, of course, is that people have two eyes horizontally next to each other. Images that are meant to be easily grasped at a glance, as well as televisions and monitors, often have a ratio adapted to the field of vision.
Not every point in the field of vision is perceived equally well. Towards the nose and upwards and downwards, the focus becomes blurrier, and faster to the top than to the bottom. In the center and on the outer edges away from the nose, however, the focus is sharper. The point of sharpest vision (fovea) is in the direction of gaze. However, the detection of movement and light sensitivity are better slightly outside the fovea.
There is a blind spot in each eye, where the optic nerve exits and where there are no light receptors. This blind spot is located approximately 15 degrees toward the nose and 1.5 degrees downwards. However, you hardly notice it because the other eye covers the spot and the brain fills in the missing information.
Last updated on 07/01/2025. Author: Jürgen Kummer
© Jumk.de Webprojects | Imprint & Privacy | German: Scheinbare Größe berechnen