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Related Experiment Videos

Phoria adaptation in patients with cerebellar dysfunction.

T C Hain1, A E Luebke

  • 1Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland.

Investigative Ophthalmology & Visual Science
|July 1, 1990
PubMed
Summary

Phoria adaptation to base-out prism was studied in patients with cerebellar lesions. Adaptation was not significantly different from controls, suggesting cerebellar lesions alone do not impair this visual function.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Science

Background:

  • Phoria adaptation is a key visual-motor response.
  • The role of the cerebellum in visual adaptation is not fully understood.
  • Cerebellar lesions can impact various neurological functions.

Purpose of the Study:

  • To investigate the effect of cerebellar lesions on phoria adaptation to horizontal base-out prism.
  • To compare adaptation in patients with cerebellar lesions to healthy controls.

Main Methods:

  • Phoria adaptation was measured using horizontal base-out prism.
  • 17 patients with documented cerebellar lesions were studied.
  • Results were compared to 10 healthy control subjects.

Main Results:

  • Mean phoria adaptation did not significantly differ between patients and controls.
  • 12 out of 17 patients showed normal adaptation.
  • Abnormal adaptation occurred in 5 patients, mostly with additional neurological lesions.

Conclusions:

  • Cerebellar lesions alone do not appear to diminish phoria adaptation to base-out prism.
  • Phoria adaptation may be preserved in the absence of other neurological deficits.
  • Concomitant nervous system lesions may be necessary to impair this adaptive response.

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