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Related Experiment Video

Updated: Oct 11, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Saccade Strategy in Alternating Exotropia.

Jonathan C Horton¹, Daniel L Adams¹, John R Economides¹

¹Department of Ophthalmology, Program in Neuroscience, University of California, San Francisco.

Shinkei Ganka = Neuro-Ophthalmology Japan

|December 6, 2021

Summary

This summary is machine-generated.

Patients with alternating exotropia use visual information from the eye that acquires new targets. This study reveals how their brain integrates visual input despite eye misalignment for efficient fixation.

Keywords:

diplopia eye fixation preference ocular dominance scotoma suppression

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Area of Science:

Ophthalmology
Neuroscience
Vision Science

Background:

Exotropia is a common strabismus characterized by outward deviation of the eyes.
Patients with alternating exotropia frequently switch fixation between eyes.
The neural mechanisms underlying target acquisition in alternating exotropia remain unclear.

Purpose of the Study:

To investigate which eye informs the brain about the location of new visual targets in patients with alternating exotropia.
To explore the relationship between suppression scotoma organization and eye choice for target acquisition.

Main Methods:

Dichoptic presentation of visual targets to 16 exotropic patients.
Targets were visible to the fixating eye, the deviated eye, or both.
Comparison of subjects' eye choice for target acquisition with suppression scotoma maps.

Main Results:

A significant correspondence was found between suppression scotoma maps and the eye used for peripheral target acquisition.
Targets perceived by a specific eye were consistently fixated by that same eye.
This indicates a functional link between visual perception and eye movement control.

Conclusions:

Patients with alternating exotropia utilize visual information from the eye that acquires peripheral targets.
Suppression scotoma organization plays a role in directing target acquisition.
Despite eye misalignment, these patients demonstrate efficient visual localization and fixation strategies.