April 2009
Volume 50, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2009
Effects of Earth-Fixed vs Head-Fixed Target on Ocular Counterroll
M. Chandrakumar; Z. Hirji; A. Blakeman; H. Goltz; G. Mirabella; A. M. Wong
Author Affiliations & Notes
  • M. Chandrakumar
    Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
  • Z. Hirji
    Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
  • A. Blakeman
    Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
  • H. Goltz
    Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
  • G. Mirabella
    Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
  • A. M. Wong
    Ophthalmology and Vision Sciences, The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
  • Footnotes
    Commercial Relationships  M. Chandrakumar, None; Z. Hirji, None; A. Blakeman, None; H. Goltz, None; G. Mirabella, None; A.M. Wong, None.
  • Footnotes
    Support  MSH 55058, MOP 152588 and MOP 57853
Investigative Ophthalmology & Visual Science April 2009, Vol.50, 2875. doi:
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      M. Chandrakumar, Z. Hirji, A. Blakeman, H. Goltz, G. Mirabella, A. M. Wong; Effects of Earth-Fixed vs Head-Fixed Target on Ocular Counterroll. Invest. Ophthalmol. Vis. Sci. 2009;50(13):2875.

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Abstract

Methods: : Twelve normal subjects were recruited. The target consists of a central fixation cross against a high-contrast grid pattern at 33 cm. The target was mounted on a vertical wall (earth-fixed), or coupled to the head (head-fixed). Eye movements were recorded using a video-based system. Changes in mean torsional eye position were plotted as a function of head position steps (0±25 deg in 5 deg steps) and five-parameter sigmoidal fits were performed. Mean OCR gains were calculated by taking the derivative of the fitted functions.

Results: : Mean OCR gain with a head-fixed target (-0.084) was 40% lower than that with an earth-fixed target (-0.141; p < 0.0001).

Keywords: eye movements • eye movements: recording techniques • ocular motor control 
© 2009, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.
Copyright © 2025 Association for Research in Vision and Ophthalmology.
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