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Depth Perception and Spatial Vision

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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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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

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Monocular Versus Binocular Calibrations in Evaluating Fixation Disparity With a Video-Based Eye-Tracker.

Aiga Švede¹, Elīna Treija², Wolfgang Jaschinski³

¹Department of Optometry and Vision Science, University of Latvia, Riga, Latvia aiga.svede@lu.lv.

|November 13, 2015

Summary

Monocular calibration provides a more physiologically accurate measurement of fixation disparity compared to binocular calibration. This method is better for understanding the full scope of vergence errors in the visual system.

Keywords:

calibration eye-tracker fixation disparity heterophoria

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Area of Science:

Oculomotor function
Vision science
Neuroscience

Background:

Fixation disparity, an oculomotor vergence error, requires precise calibration for accurate measurement.
Monocular calibration assumes foveal fixation, while binocular calibration may be influenced by existing vergence errors.

Purpose of the Study:

To compare the precision and physiological appropriateness of monocular versus binocular calibration methods for measuring fixation disparity.
To evaluate the impact of calibration type on fixation disparity measurements during a dot scanning task.

Main Methods:

Participants underwent both monocular and binocular calibration procedures.
Fixation disparity was measured during a dot scanning task following each calibration type.
Statistical analysis compared fixation disparity values obtained from the two calibration methods.

Main Results:

A significant difference in fixation disparity was observed between monocular and binocular calibrations in 11 out of 19 participants.
Heterophoria had a greater impact on fixation disparity measurements following monocular calibration compared to binocular calibration.

Conclusions:

Monocular calibration appears to yield a more physiologically plausible fixation disparity measurement.
Monocular calibration is suggested as a more appropriate method for comprehensively studying fixation disparity and associated vergence states.