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Multipurpose Bio-Monitored Integrated Circuit in a Contact Lens Eye-Tracker
Loïc Massin1,2, Cyril Lahuec1,2, Fabrice Seguin1,2
1Optics Department, Institut Mines-Télécom Atlantique, Technopôle Brest Iroise, CS 83818, CEDEX 03, 29238 Brest, Brittany, France.
Sensors (Basel, Switzerland)
|January 22, 2022
Summary
We developed an advanced eye-tracking system using a scleral contact lens with an integrated circuit (Application Specific Integrated Circuit). This system achieves high accuracy for gaze detection and blink-based command recognition.
Area of Science:
- Biomedical Engineering
- Integrated Circuit Design
- Ophthalmology
Background:
- Current eye-tracking technologies face limitations in accuracy and robustness.
- Wearable electronics offer potential for advanced human-computer interfaces.
- Scleral contact lenses provide a stable platform for intraocular device integration.
Purpose of the Study:
- To design, fabricate, and test a multipurpose integrated circuit for a scleral contact lens.
- To enable accurate gaze direction detection and eye-blink sequence recognition.
- To develop a wirelessly powered eye-tracking system integrated into eyewear.
Main Methods:
- Utilized AMS 0.35 µm Complementary Metal Oxide Semiconductor technology for Application Specific Integrated Circuit fabrication.
- Integrated photodiodes into a scleral contact lens for photocurrent measurement.
- Implemented centroid computation for gaze direction determination.
- Validated the system using a mock-up eyeball, artificial eyelid, and infrared photodiodes.
Main Results:
- Achieved an eye-tracking accuracy of 0.2°, surpassing current mobile video-based systems by 2.5 times.
- Demonstrated robustness against process variations, operating time, and supply voltage fluctuations.
- Successfully detected eye-blink sequences for target designation validation.
- Showcased the potential for blink-based commands through gaze direction variations.
Conclusions:
- The developed integrated circuit and scleral contact lens system offers a highly accurate and robust eye-tracking solution.
- This technology enables advanced human-computer interaction through gaze detection and blink-based commands.
- The system's performance and versatility pave the way for novel assistive and control applications.
