Stereopsis is the visual perception of depth or three-dimensionality caused by the fusion of the slightly disparate images from the two eyes. It allows humans and many other animals to accurately perceive the distances and spatial relationships between objects in their environment.

How Stereopsis Works:

Stereopsis relies on the binocular disparity, which is the slight difference in the position of an object as seen by the left and right eyes. Each eye perceives a slightly different perspective of the world due to the horizontal separation between them. The brain then combines these different perspectives to form a singular and three-dimensional image.

Importance of Stereopsis:

Stereopsis plays a crucial role in depth perception, aiding in activities that require accurate distance judgement, such as reaching for objects, navigating through obstacles, and driving. It provides humans with enhanced spatial awareness, allowing for better coordination and interaction with the surrounding environment.

Development of Stereopsis:

Stereopsis typically develops in humans during infancy as the visual system matures and the brain learns to integrate inputs from both eyes. Adequate binocular vision during early childhood is essential for the normal development of stereopsis. Certain visual disorders or abnormal eye conditions can impede the proper development of this important visual ability.

Stereopsis Testing:

Eye care professionals often assess stereopsis to diagnose vision problems related to depth perception accurately. Various tests, such as the Random Dot Stereogram or the polarized glasses test, are used to evaluate an individual’s ability to perceive depth and determine the presence of any binocular vision disorders.