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Related Experiment Video

Updated: May 23, 2026

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

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

Published on: July 21, 2020

Amblyopic deficits in processing structure-from-motion.

Jesse S Husk¹, Reza Farivar, Robert F Hess

¹McGill Vision Research Unit, Department of Ophthalmology, McGill University, and Royal Victoria Hospital, Montreal, Quebec, Canada. jesse.husk@mail.mcgill.ca

Journal of Vision

|April 17, 2012

Summary

This summary is machine-generated.

People with amblyopia, or lazy eye, struggle with structure-from-motion (SFM) tasks. This visual processing deficit appears to occur at a high level of brain function, impacting depth perception.

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Area of Science:

Neuroscience
Ophthalmology
Visual Perception

Background:

Amblyopia is associated with various cortical deficits, affecting both low- and high-level visual processing.
Extrastriate cortex is known to be selectively impaired in signal/noise tasks but not simple integration tasks in amblyopia.

Purpose of the Study:

To investigate if extrastriate processing is compromised at the combined dorsal and ventral information level in amblyopia.
To assess amblyopic observers' performance on a structure-from-motion (SFM) task, which requires signal integration for depth perception.

Main Methods:

Amblyopic and control observers performed a 2-alternative forced-choice (2-AFC) shape discrimination task using SFM stimuli.
Stimuli were presented monocularly, requiring observers to distinguish between same and different depth-defined shapes presented consecutively.
Contrast thresholds were controlled to isolate high-level processing deficits.

Main Results:

Amblyopic observers demonstrated significantly higher depth thresholds compared to control observers.
This deficit persisted even after accounting for differences in contrast sensitivity.
The SFM deficit was observed in both the amblyopic and the fellow-fixing eyes.

Conclusions:

The findings suggest a high-level locus for the structure-from-motion deficit in amblyopia.
Impaired integration of dorsal and ventral information in the extrastriate cortex may underlie this deficit.
This highlights a specific high-level visual processing impairment in amblyopia beyond basic visual acuity issues.