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Related Experiment Videos

An adaptable association between vertical and horizontal vergence

C M Schor1, J W McCandless

  • 1Vision Science Group, School of Optometry, University of California, Berkeley 94720, U.S.A.

Vision Research
|December 1, 1995
PubMed
Summary
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Vertical phoria, a vergence error, adapts to eye position. Adapting vertical vergence to targets along the depth axis yielded a greater aftereffect than along the vertical axis.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Vertical phoria represents a vergence error during monocular viewing.
  • It plays a role in compensating for oculomotor system changes.
  • Previous research linked vertical phoria to conjugate eye position.

Purpose of the Study:

  • To investigate the difference in vertical phoria adaptation based on target separation (vertical vs. depth axis).
  • To explore the association between vertical phoria and horizontal vergence.
  • To understand the neural underpinnings of vertical vergence adaptation.

Main Methods:

  • Adaptation of vertical phoria using vertically disparate targets separated along the depth axis versus the vertical axis.
  • Measurement of vertical vergence aftereffects.

Related Experiment Videos

  • Analysis of the dependency on horizontal vergence and conjugate eye position.

    • Main Results:

    • Vertical phoria adaptation was significantly influenced by horizontal vergence.
    • The vertical vergence aftereffect was approximately four times greater for targets separated along the depth axis compared to the vertical axis.
    • Vertical phoria aftereffects were also induced by accommodative vergence.

    Conclusions:

    • Vertical phoria can be trained to vary with conjugate eye position.
    • The oculomotor system exhibits cross-coupling between vertical vergence and systems controlling conjugate and horizontal vergence.
    • This interaction may allow for correction of disturbances in supranuclear control regions.