Stereosehen

Stereosehen, also known as stereopsis or stereoscopic vision, is the binocular vision cue for depth perception. It arises from the fact that humans have two eyes positioned a small distance apart, resulting in slightly different images of the world being projected onto each retina. The brain processes these two images, comparing the disparities between corresponding points in each image to calculate the distance of objects from the observer.

The degree of disparity is inversely related to the perceived distance. Objects that are closer to the observer will have a larger disparity between their images on the retinas, while objects further away will have a smaller disparity. This difference in perspective allows us to perceive the three-dimensional structure of our environment. Stereosehen is a crucial component of depth perception, enabling us to navigate our surroundings, judge distances for actions like catching a ball, and appreciate the visual world in its full dimensionality. While it is a powerful depth cue, it is most effective for objects within a certain range, typically from a few meters up to several tens of meters. Beyond this range, other depth cues like relative size and atmospheric perspective become more prominent.