🔹 Current Scientific Data:

Stereoscopic vision (or Stereopsis)  is the ability to perceive depth and distances in three-dimensional space due to binocular disparity (the difference between the images received by each eye). It is important for precise movements, spatial orientation, and many everyday functions.

Recent reviews show that stereoscopic perception varies among people: impairment of stereopsis or its absence (stereoblindness) depends on the methods of measurement and individual characteristics.

Classical clinical methods for assessing stereopsis use polarised and test images to reliably determine the ability to perceive volume  independently of monocular cues.

Even in adults with stereoscopic vision dysfunction, partial restorative plasticity is possible through special training programs that improve the quality of stereoscopic vision.

🔹 Perceive volume independently of monocular cues

Monocular cues are signals of depth that work with one eye: object overlap, perspective, size change, lighting..

Binocular cues—volume is formed due to the different images received from the left and right eyes (binocular disparity).

The essence of stereopsis tests (Randot, Fly Test, Lang) is that volume is visible only with normal binocular vision; monocular cues do not help in this case.

A person with impaired stereopsis sees only a flat image, even if monocular signals are present.

🔹 Clinical Significance: Stereopsis disorders may be associated with amblyopia, squint, or other disorders of binocular interaction of the eyes. This may affect the assessment of space and distances in everyday life and professional activities.

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