Related Experiment Video
Updated: Apr 20, 2026
Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
Effect of artificial scotomas on open-loop disparity vergence eye movements
Dongsheng Yang1, Richard W Hertle, Mingxia Zhu
1*MD, PhD †MD ‡PhD Department of Ophthalmology, Shanghai Children's Hospital, Jiaotong University, Shanghai, China (DY, ZT); Vision Center, Department of Ophthalmology, The Children's Hospital of Akron, Northeast Ohio Medical University, Akron, Ohio (DY, RWH, MK); Optometry Centre, School of Chemical and Life Sciences, Singapore Polytechnic, Singapore, Singapore (MZ); and Department of Biomedical Engineering, University of Minnesota, Twin Cities, Minneapolis, Minnesota (EH).
Purpose:
To investigate the effect of an artificial scotoma on open-loop disparity vergence responses (DVRs) and vergence control mechanisms, we examined open-loop DVRs to disparity stimuli using monocular artificial scotomas in normal subjects.
Methods:
Using a mirror haploscope with two computer monitors, we delivered disparity stimuli on a pair of random dot patterns subtending 40 by 30 degrees at 47 cm from each eye. The scotomas were black circles located in the center of a random dot pattern for the left eye. Eye movements of both eyes were recorded with a magnetic search coil system.
Results:
We first found that the amplitudes of DVRs were gradually decreased and the latency of DVRs was moderately increased as the size of the scotomas was increased. Second, monocular responses from each eye were symmetrical although the stimuli to each eye were asymmetrical.
Conclusions:
The results suggest that the monocular eye movements in disparity vergence are controlled by a binocular central mechanism, not driven separately by monocular inputs in the open-loop window.
More Related Videos
07:12Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
Published on: April 11, 2025
08:27Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
Published on: March 3, 2023