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Stereopsis (from Ancient Greek στερεός 'solid' and ὄψις (ópsis) 'appearance, sight') is the component of depth perception retrieved through binocular vision. [1] Stereopsis is not the only contributor to depth perception, but it is a major one.
As a result of this overlap of vision, binocular vision provides depth. [17] Stereopsis (from stereo- meaning "solid" or "three-dimensional", and opsis meaning "appearance" or "sight") is the impression of depth that is perceived when a scene is viewed with both eyes by someone with normal binocular vision. [17]
Howard-Dolman test. Stereoacuity [1] is most simply explained by considering one of its earliest test, a two-peg device, named Howard-Dolman test after its inventors: [2] The observer is shown a black peg at a distance of 6m (=20 feet). A second peg, below it, can be moved back and forth until it is just detectably nearer than the fixed one.
Binocular cues are based on the receipt of sensory information in three dimensions from both eyes and monocular cues can be observed with just one eye. [2] [3] Binocular cues include retinal disparity, which exploits parallax and vergence. Stereopsis is made possible with binocular vision.
Dynamic random-dot stereograms containing binocular motion stimuli can be designed to test whether someone has at least rudimentary stereopsis. One study found that in strabismic patients a dynamic random dot stereogram yielded a significantly higher rate detection rate for stereopsis than the Titmus fly stereotest. [9]
The Worth Four Light Test, also known as the Worth's four dot test or W4LT, is a clinical test mainly used for assessing a patient's degree of binocular vision and binocular single vision. Binocular vision involves an image being projected by each eye simultaneously into an area in space and being fused into a single image.
Among the resulting 36 subjects aged 6–30 years, many had regained binocular vision (56% according to an evaluation with Bagolini striated glasses, 39% with Titmus test, 33% with Worth 4-dot test, and 22% with Random dot E test) and 57% had stereoacuity of 200 sec of arc of better, leading to the conclusion that some degrees of stereopsis can ...
Fixation disparity is a tendency of the eyes to drift in the direction of the heterophoria.While the heterophoria refers to a fusion-free vergence state, the fixation disparity refers to a small misalignment of the visual axes when both eyes are open in an observer with normal fusion and binocular vision. [1]