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Binocular eye tracking with the Tracking Scanning Laser Ophthalmoscope
S B Stevenson1, C K Sheehy1, A Roorda1
1University of Houston College of Optometry, Berkeley School of Optometry, USA; University of California, Berkeley School of Optometry, USA.
Vision Research
|February 14, 2015
Summary
This study introduces a novel binocular retinal imaging technique for precise eye motion tracking. The system achieves high temporal and spatial resolution, enabling detailed analysis of ocular motility.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Neuroscience
Background:
- High-magnification retinal imaging allows precise eye motion tracking (<1 arc minute).
- Existing systems typically provide only monocular recordings.
- Simultaneous binocular tracking offers enhanced data for studying ocular motility.
Purpose of the Study:
- To describe a modification of the Tracking Scanning Laser Ophthalmoscope for simultaneous binocular retinal scanning.
- To evaluate the precision and resolution of this new binocular eye-tracking system.
- To compare binocular tracking results with existing monocular techniques.
Main Methods:
- A modified Tracking Scanning Laser Ophthalmoscope splits the optical path to scan both retinas simultaneously.
- A mirror redirects half of each horizontal scan line to the fellow eye, creating a split-image video.
- Fast Fourier Transform (FFT)-based image analysis in Matlab extracts eye position from recorded videos.
Main Results:
- The binocular system achieves high temporal and spatial resolution for eye movement traces.
- Tracking noise levels were estimated between 0.25–0.5 arcmin SD for individual subjects.
- Binocular recordings showed left/right eye differences of 1–2 arcmin SD vertically and 10–15 arcmin SD horizontally.
Conclusions:
- The developed binocular retinal imaging system enables simultaneous, high-resolution tracking of eye motion.
- This technique provides valuable data for understanding binocular ocular motility.
- The results align with established values from other eye-tracking methodologies.
