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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 5 — May. 17, 2007

Directional eye fixation sensor using birefringence-based foveal detection

Boris I. Gramatikov, Othman H. Y. Zalloum, Yi Kai Wu, David G. Hunter, and David L. Guyton  »View Author Affiliations


Applied Optics, Vol. 46, Issue 10, pp. 1809-1818 (2007)
http://dx.doi.org/10.1364/AO.46.001809


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Abstract

We recently developed and reported an eye fixation monitor that detects the fovea by its radial orientation of birefringent nerve fibers. The instrument used a four-quadrant photodetector and a normalized difference function to check for a best match between the detector quadrants and the arms of the bow-tie pattern of polarization states surrounding the fovea. This function had a maximum during central fixation but could not tell where the subject was looking relative to the center. We propose a linear transformation to obtain horizontal and vertical eye position coordinates from the four photodetector signals, followed by correction based on a priori calibration information. The method was verified on both a computer model and on human eyes. The major advantage of this new eye-tracking method is that it uses true information coming from the fovea, rather than reflections from other structures, to identify the direction of foveal gaze.

© 2007 Optical Society of America

OCIS Codes
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(200.4560) Optics in computing : Optical data processing
(260.1440) Physical optics : Birefringence
(260.5430) Physical optics : Polarization
(330.2210) Vision, color, and visual optics : Vision - eye movements
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices

ToC Category:
Optical microscopy techniques and technology

History
Original Manuscript: April 28, 2006
Revised Manuscript: September 29, 2006
Manuscript Accepted: October 6, 2006
Published: March 13, 2007

Virtual Issues
Vol. 2, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Boris I. Gramatikov, Othman H. Y. Zalloum, Yi Kai Wu, David G. Hunter, and David L. Guyton, "Directional eye fixation sensor using birefringence-based foveal detection," Appl. Opt. 46, 1809-1818 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-46-10-1809

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