Kappa and Hirschberg ratio measured with an automated video gaze tracker.

  title={Kappa and Hirschberg ratio measured with an automated video gaze tracker.},
  author={Frank Schaeffel},
  journal={Optometry and vision science : official publication of the American Academy of Optometry},
  volume={79 5},
  • Frank Schaeffel
  • Published 2002 in
    Optometry and vision science : official…
PURPOSE To develop a fast automated procedure to measure kappa and the Hirschberg ratio for immediate use in a video gaze tracker. METHODS Using the hardware platform of the PowerRefractor and a 200 mm lens, the pupil was imaged with a resolution of 57 pixels/mm, at a camera distance of 90 cm. Both the positions of the first Purkinje image and the edges of the pupil were located at 25 Hz sampling rate with subpixel resolution using video image processing software developed under Borland C… CONTINUE READING

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