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A novel fiber Bragg grating system for eye tracking.

Sharath Umesh1, Shweta Pant1, Srivani Padma1,2

  • 1Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, India.

Journal of Advanced Research
|March 23, 2019
PubMed
Summary

This study introduces a novel wearable Fiber Bragg Grating Eye Tracker (FBGET) for noninvasive eye movement evaluation. The device accurately captures eye movements, proving feasible for real-time clinical diagnosis.

Keywords:
Eye muscular movement detectionEye trackerFiber Bragg grating sensor

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Area of Science:

  • Biomedical Engineering
  • Ophthalmology
  • Neuroscience

Background:

  • Accurate eye movement evaluation is crucial for diagnosing ophthalmological and neurological conditions.
  • Existing eye-tracking methods can be invasive or cumbersome.
  • A need exists for noninvasive, wearable diagnostic tools.

Purpose of the Study:

  • To develop and validate a novel, noninvasive, wearable eye-tracking device using Fiber Bragg Grating (FBG) sensors.
  • To assess the feasibility of the Fiber Bragg Grating Eye Tracker (FBGET) for dynamic eye movement analysis.
  • To demonstrate the FBGET's potential as a point-of-care diagnostic tool.

Main Methods:

  • A wearable device, the Fiber Bragg Grating Eye Tracker (FBGET), was developed using FBG sensors.
  • The device captures eyeball displacement via strain variations on a cantilever, triggered by lower eyelid movement.
  • Eye movements (fixations, saccades) were tracked dynamically and validated against conventional camera-based systems.

Main Results:

  • The FBGET successfully captured eye-gaze movement dynamics, including fixations and saccades.
  • Simultaneous recordings confirmed the FBGET's real-time applicability and accuracy compared to camera-based trackers.
  • Experimental results demonstrated the feasibility of the proposed methodology.

Conclusions:

  • A novel methodology for eye tracking using lower eyelid displacement and FBG sensors was successfully illustrated.
  • The wearable FBGET offers a noninvasive, user-friendly solution for eye movement evaluation.
  • The device is suitable for clinical and hospital environments, functioning as a point-of-care diagnostic tool.