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Both of these mechanisms are neurally linked forming the accommodation-convergence reflex [1] of eyes. One can distinguish vergence distance — a distance of a point towards which both eyes are converging, and an accommodation distance — a distance of a region in space towards which the focus or refractive power of the ...
Binocular disparity is the difference in image location of an object seen by the left and right eyes, resulting from the eyes' horizontal separation. It is a depth cue that allows us to perceive the depth of objects in stereopsis. Learn how it is measured, computed and used in computer vision, astronomy and neuroscience.
Convergence is a binocular oculomotor cue for distance and depth perception. Because of stereopsis, the two eyeballs focus on the same object; in doing so they converge. The convergence will stretch the extraocular muscles – the receptors for this are muscle spindles. As happens with the monocular accommodation cue, kinesthetic sensations ...
Stereoscopy is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. Learn about the history of stereoscopy, the different methods of displaying stereograms, and the uses of stereoscopy in various fields.
Vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision. Learn about the different types of vergence, such as convergence, divergence and fusional vergence, and the common vergence dysfunctions that affect eye alignment and vision.
The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision in the presence of increasing vergence demands.
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Accommodation is the process by which the vertebrate eye changes optical power to maintain a clear image or focus on an object as its distance varies. Learn about the different mechanisms of accommodation in animals living in air, water and both environments.