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Related Experiment Videos

Digitally calibrated eye movement measurement system.

L S Baczkowski1, J D Enderle, E J Engelken

  • 1Department of Electrical & Electronics Engineering, North Dakota University, Fargo 58105.

Biomedical Sciences Instrumentation
|January 1, 1991
PubMed
Summary

This study presents a low-cost instrumentation method for recording horizontal eye movements using a charged coupled device (CCD) sensor. The technique offers a feasible, affordable alternative for eye tracking research.

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Area of Science:

  • Biomedical Engineering
  • Ophthalmology
  • Neuroscience

Background:

  • Accurate eye movement recording is crucial for research.
  • Existing eye tracking technologies are often prohibitively expensive.
  • A need exists for cost-effective instrumentation for eye movement analysis.

Purpose of the Study:

  • To present a feasibility study for a less expensive instrumentation alternative to record horizontal eye movements.
  • To introduce a novel eye tracking system based on the limbus position technique.
  • To demonstrate a system costing under $3000.00.

Main Methods:

  • Utilized a linear charged coupled device (CCD) image array sensor and a biconvex lens to detect pupil position.
  • Employed digital logic to control the CCD array and convert its output signal to a TTL compatible signal.

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  • Developed C programming for data acquisition and system calibration, and FORTRAN for digital signal processing and eye position estimation.
  • Main Results:

    • Successfully developed a functional prototype for recording horizontal eye movements.
    • The system achieved a cost of less than $3000.00, significantly lower than existing methods.
    • Demonstrated the feasibility of using CCD technology and limbus tracking for eye position determination.

    Conclusions:

    • The proposed instrumentation offers a viable and economical solution for eye movement recording in research settings.
    • This cost-effective technique can increase accessibility to eye tracking technology.
    • Further development could expand the application of this system in various research fields.