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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: Sep 8, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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An ecological approach to binocular vision.

Barbara Gillam1

  • 1The University of New South Wales, Sydney, Australia.

I-Perception
|June 13, 2022
PubMed
Summary

This study explores the ecological approach to binocular vision, focusing on how environmental spatial layouts and depth gradients influence 3D perception. It examines how global factors resolve local stereoscopic ambiguities.

Area of Science:

  • Visual Perception
  • Ecological Psychology
  • Computational Neuroscience

Background:

  • The ecological approach to binocular vision, emphasizing environmental factors, has roots in Wheatstone's stereograms and J. J. Gibson's theories.
  • Recent research provides detailed analysis and experimentation supporting this ecological perspective on vision.

Purpose of the Study:

  • To discuss recent research on the ecological approach to binocular vision.
  • To highlight the influence of environmentally occurring spatial layouts on binocular vision.
  • To explore how depth gradients and monocular regions affect stereoscopic perception.

Main Methods:

  • Review of recent experimental and analytical research supporting an ecological approach to binocular vision.
  • Analysis of spatial layouts, including depth gradients and regions visible to only one eye.
Keywords:
3D perceptionbinocular visionscene perceptionstereopsis

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  • Investigation into the resolution of local stereoscopic ambiguity by global factors.

    • Main Results:

    • Environmentally occurring spatial layouts significantly influence binocular vision.
    • Depth gradients provide crucial information for stereoscopic perception.
    • Global visual factors play a role in resolving local stereoscopic ambiguities.

    Conclusions:

    • The ecological approach offers a valuable framework for understanding binocular vision.
    • Environmental context and global scene properties are essential for accurate 3D perception.
    • Further research into these factors can advance our understanding of visual processing.