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An infrared system for determining ocular position.

G A Rinard, R W Matteson, R W Quine

    ISA Transactions
    |January 1, 1980
    PubMed
    Summary
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    This study presents an eye-tracking device for severely handicapped individuals, utilizing an infrared LED and a dynamic RAM image transducer to determine eye position for communication systems.

    Area of Science:

    • Bioengineering
    • Biomedical Engineering
    • Assistive Technology

    Background:

    • Accurate eye position determination is crucial for communication and control systems for individuals with severe handicaps.
    • Previous research has explored various methods for eye tracking over the past decade.
    • Developing reliable and user-friendly eye-tracking technology remains an ongoing challenge.

    Purpose of the Study:

    • To develop and evaluate a novel ocular controlled communications device.
    • To investigate accurate methods for determining eye position for assistive technology applications.
    • To create a practical eye-tracking system for severely handicapped individuals.

    Main Methods:

    • An infrared Light Emitting Diode (LED) was mounted on eyeglass frames to illuminate the cornea.

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  • A dynamic Random Access Memory (RAM) image transducer (32x32 cells) was used to capture reflected light.
  • Transistor-Transistor Logic (TTL) scanning circuitry processed the image to determine eye position from the illuminated RAM cell address.

    • Main Results:

    • A highly satisfactory eye-tracking device was developed.
    • The device accurately determines eye position by analyzing reflected infrared light from the cornea.
    • The system is currently undergoing clinical evaluation as part of a communication system.

    Conclusions:

    • The developed eye-tracking device shows significant promise for assistive communication.
    • This bioengineering approach offers a viable solution for individuals with severe physical limitations.
    • Further clinical evaluation is essential to confirm the system's efficacy in real-world communication scenarios.