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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 .
Binocular neurons in the dorsal and ventral pathways combine to create depth perception, however, the two pathways perform differ in the type of stereo computation they perform. [7] The dorsal pathway generally performs a cross-correlation based upon the region of the different retinal images, while the ventral pathway fixes the multiple ...
The coarse stereoscopic system seems to be able to provide residual binocular depth information in some individuals who lack fine stereopsis. [17] Individuals have been found to integrate the various stimuli, for example stereoscopic cues and motion occlusion, in different ways. [18]
2D-to-3D conversion adds the binocular disparity depth cue to digital images perceived by the brain, thus, if done properly, greatly improving the immersive effect while viewing stereo video in comparison to 2D video.
Because cyclopean images are created using binocular depth cues, cyclopean images are important in understanding the surroundings of an individual in any given environment. Images with greater salience allow for an optimal use of a cyclopean image, as important details can be extracted.
About 5% of individuals are unable to perceive depth in random-dot stereograms due to various disorders of binocular vision. These individuals can be identified with random-dot stereotests. The stereoacuity is measured from the patient's ability to identify forms from random dot backgrounds, as presented on several plates or pages of a book.
This stimulus is perceptually bistable and may appear to rotate either left or right. To test for cue recruitment, binocular disparity cues (3D cues) were added to the Necker cube, to specify which part of the cube was in front and which was in back. The apparent direction of rotation was thereby brought under experimenter control.
Stereoscopy creates the impression of three-dimensional depth from a pair of two-dimensional images. [5] Human vision, including the perception of depth, is a complex process, which only begins with the acquisition of visual information taken in through the eyes; much processing ensues within the brain, as it strives to make sense of the raw information.