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An electro-ocular switch for communication of the speechless
Medical Progress Through Technology
|January 1, 1983
Summary
This study introduces an electrooculography (EOG) switch for eye movement detection, offering a cost-effective and versatile alternative for communication aids. The device enhances accessibility for non-vocal individuals with disabilities.
Area of Science:
- Biomedical Engineering
- Assistive Technology
- Neuroscience
Background:
- Electrooculography (EOG) is a method to measure the electrical potential difference between the cornea and retina.
- Existing eye-tracking technologies, like infrared limbus-pupil reflection, have limitations in detecting vertical eye movements and can be costly.
- Developing accessible and affordable communication aids is crucial for individuals with severe motor impairments.
Purpose of the Study:
- To design and evaluate a novel EOG-based switch system for communication.
- To compare the EOG switch with existing eye-tracking methods, highlighting its advantages.
- To assess the feasibility of the EOG switch for patients with quadriplegia.
Main Methods:
- The EOG switch was developed based on detecting saccadic velocity exceeding a threshold.
- AC-coupling was employed to mitigate DC drift during EOG recording.
- An optocoupler was integrated for patient safety during communication via the Handiwriter system.
Main Results:
- The EOG switch demonstrated effective detection of eye movements for communication.
- The system proved to be a cost-effective alternative to infrared-based eye switches.
- Successful preliminary trials were conducted with quadriplegic patients (CVA and ALS).
Conclusions:
- The designed EOG switch is a viable, low-cost, and safe communication tool for non-vocal individuals.
- Its ability to detect vertical eye movements and affordability make it preferable to other eye-tracking methods.
- The study identified potential patient groups who could benefit from this assistive technology.