October 1988
Volume 29, Issue 10
Free
Articles  |   October 1988
Stability of tonic vergence.
Author Affiliations
  • S K Fisher
    Department of Vision Sciences, Schnurmacher Institute for Vision Research, SUNY/State College of Optometry, New York 10010.
  • K J Ciuffreda
    Department of Vision Sciences, Schnurmacher Institute for Vision Research, SUNY/State College of Optometry, New York 10010.
  • B Tannen
    Department of Vision Sciences, Schnurmacher Institute for Vision Research, SUNY/State College of Optometry, New York 10010.
  • P Super
    Department of Vision Sciences, Schnurmacher Institute for Vision Research, SUNY/State College of Optometry, New York 10010.
Investigative Ophthalmology & Visual Science October 1988, Vol.29, 1577-1581. doi:
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      S K Fisher, K J Ciuffreda, B Tannen, P Super; Stability of tonic vergence.. Invest. Ophthalmol. Vis. Sci. 1988;29(10):1577-1581.

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

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Abstract

Tonic vergence was monitored at 30 min intervals over a 10 hr period of a single day and at intervals of approximately 14 days over a period of 19 weeks. Measurements were also made during a continuous 112 min period in total darkness. Tonic vergence showed neither significant systematic variation nor large random fluctuations during the course of either a day or weeks, demonstrating stability under naturally occurring viewing conditions. During the period in total darkness, however, tonic vergence exhibited a significant decreasing trend, ie, eye position became less convergent with time. Stability was therefore poorer in the absence of visual stimuli.

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