May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Quick Phase Analysis of the Involuntary Version-Vergence Nystagmus
Author Affiliations & Notes
  • D. Yang
    Ophthalmology, University of Pittsburgh Childrens Hospital, Pittsburgh, Pennsylvania
  • R. W. Hertle
    Ophthalmology, University of Pittsburgh Childrens Hospital, Pittsburgh, Pennsylvania
  • M. Zhu
    Ophthalmology, University of Pittsburgh Childrens Hospital, Pittsburgh, Pennsylvania
  • Footnotes
    Commercial Relationships  D. Yang, None; R.W. Hertle, None; M. Zhu, None.
  • Footnotes
    Support  NIH EY, RPB
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 134. doi:
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      D. Yang, R. W. Hertle, M. Zhu; Quick Phase Analysis of the Involuntary Version-Vergence Nystagmus. Invest. Ophthalmol. Vis. Sci. 2008;49(13):134.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To study saccade-vergence interaction we analyzed the quick phases of the involuntary version-vergence nystagmus induced by motion stimuli in the ground plane.

Methods: : We displayed backward/forward motion stimuli on a monitor positioned face-up and 10 cm below the eyes. Using a search coil system, we digitized the eye movement.

Results: : It was found that the involuntary version-vergence nystagmus had both vertical version and horizontal vergence components. Backward motion induced monophasic divergent quick phases and upward versional quick phases; forward motion induced biphasic divergence-convergence quick phases and downward versional quick phases. A time dissociation of about 20 ms between version velocity peak and convergence velocity peak was observed. Linear relationships between vergence peak velocity and versional saccadic peak velocity were demonstrated.

Keywords: eye movements • ocular motor control • vergence 
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