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Updated: Feb 12, 2026
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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
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Objective Evaluation of Visual Fatigue Using Binocular Fusion Maintenance
Masakazu Hirota1, Takeshi Morimoto1, Hiroyuki Kanda1
1Department of Applied Visual Science, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
Translational Vision Science & Technology
|March 31, 2018
Summary
Binocular fusion maintenance (BFM) offers an objective method to assess visual fatigue. This new technique accurately quantifies eye strain, outperforming traditional tests for evaluating fatigue from visual tasks.
Area of Science:
- Ophthalmology
- Visual Science
- Human Factors
Background:
- Visual fatigue is a common complaint impacting daily activities and productivity.
- Current methods for assessing visual fatigue are often subjective and lack quantitative precision.
- Objective biomarkers are needed for reliable visual fatigue evaluation.
Purpose of the Study:
- To investigate the potential of binocular fusion maintenance (BFM) as an objective measure of visual fatigue.
- To quantitatively assess visual fatigue by measuring the ability to sustain binocular fusion.
Main Methods:
- Developed a custom Shack-Hartmann wavefront aberrometer with liquid crystal shutters to measure BFM.
- Measured eye movements and wavefront aberrations simultaneously during a controlled visual task.
- Assessed BFM in 40 healthy subjects before and after a 30-minute visual task, correlating results with subjective fatigue scores.
Main Results:
- BFM significantly decreased after the visual task (P < 0.001).
- Reduced BFM correlated negatively with subjective eye symptom scores (adjusted R² = 0.752, P < 0.001).
- BFM demonstrated higher diagnostic accuracy for visual fatigue compared to conventional tests (P = 0.007).
Conclusions:
- BFM serves as a reliable objective indicator for evaluating visual fatigue.
- This method can assess visual fatigue induced by novel visual devices like head-mounted displays.
- BFM provides a quantitative and objective approach to understanding visual strain.
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