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Recording eye movements using coaxial cameras--applications for visual ergonomics and reading studies
1Department of Optometry and Vision Sciences, University of Melbourne, Parkville, Victoria, Australia.
Summary
This study presents a low-cost, simple eye-tracking system using coaxial video cameras. The system accurately records eye position for applications in visual ergonomics and sports vision.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Human Factors Engineering
Background:
- Accurate eye-tracking is crucial for understanding visual behavior.
- Existing eye-tracking systems can be expensive and complex.
- There is a need for cost-effective and user-friendly eye-tracking solutions.
Purpose of the Study:
- To develop and evaluate a novel, low-cost coaxial video camera system for monocular eye position recording.
- To assess the accuracy and potential applications of this new eye-tracking technique.
Main Methods:
- A system of coaxial video cameras was developed, integrating miniature cameras with a cube beam-splitting prism.
- An infrared emitting diode was imaged on the cornea to determine eye position.
- Images of the eye and scene were superimposed using a digital video mixer.
Main Results:
- The developed system achieved an accuracy of approximately 0.5 degrees within 15 degrees of primary gaze.
- The system is characterized by its low cost and simple design, minimizing the need for complex data analysis.
- The instrument was successfully used to monitor eye position in individuals using low vision devices.
Conclusions:
- The coaxial video camera system offers a practical and affordable solution for eye-tracking.
- Potential applications include visual ergonomics, sports vision, and assistive technology for low vision.
- Further improvements in camera optics could enable helmet-mounted and remote monitoring capabilities.