Directional eye fixation sensor using birefringence-based foveal detection

Boris I. Gramatikov, Othman H.Y. Zalloum, Yi Kai Wu, David G. Hunter, David L. Guyton

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1809-1818
Number of pages10
JournalApplied Optics
Issue number10
StatePublished - Apr 1 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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