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Updated: Jul 5, 2026
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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
A novel haploscopic viewing apparatus with a three-axis eye tracker
Nicholas A Ramey1, Howard S Ying, Kristina Irsch
1The Krieger Children's Eye Center at The Wilmer Institute The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-9028, USA. nramey1@gmail.com
Summary
This study validates a new haploscope for measuring eye movements, confirming its accuracy and precision for studying normal eye control and strabismus mechanisms.
Area of Science:
- Ophthalmology
- Neuroscience
- Biomedical Engineering
Background:
- Accurate measurement of eye position is crucial for understanding oculomotor control.
- Cyclovertical strabismus involves complex eye alignment issues.
- Novel devices are needed to precisely assess these conditions.
Purpose of the Study:
- To validate the accuracy and precision of a novel haploscope.
- To assess its utility in investigating normal eye control mechanisms.
- To evaluate its application in studying cyclovertical strabismus in pediatric and adult subjects.
Main Methods:
- A novel haploscope with video oculography was developed.
- Accuracy and precision were tested using a model eye and human subjects.
- Ocular torsion during head tilt (ocular counter-roll) was measured.
Main Results:
- The haploscope demonstrated high accuracy (Pearson R=1.0) with minimal residual error (19±5 arcmin for model eye, 21±9 arcmin for human subjects).
- Measurements of ocular counter-roll averaged 5.7±0.9 degrees.
- The device effectively measured eye movements under various conditions.
Conclusions:
- The novel haploscope is validated for accuracy and precision.
- It is suitable for future research into oculomotor control and alignment.
- This tool can advance the study of strabismus and normal binocular vision.
