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Related Experiment Videos

How normal are "normal" square wave jerks?

J Shallo-Hoffmann1, J Petersen, H Mühlendyck

  • 1Department of Strabismology and Neuroophthalmology, University of Göttingen, Federal Republic of Germany.

Investigative Ophthalmology & Visual Science
|May 1, 1989
PubMed
Summary
This summary is machine-generated.

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Electro-oculography (EOG) assessed fixation stability in 50 subjects. Square wave jerks (SWJ) were most frequent in darkness and with eyes closed, establishing normal ranges for EOG testing.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Physiology

Background:

  • Fixation stability is crucial for visual processing.
  • The saccadic system controls eye movements, including fixation.
  • Electro-oculography (EOG) is a clinical tool to assess eye movements.

Purpose of the Study:

  • To investigate the fixation stability of the saccadic system using horizontal electro-oculography (EOG).
  • To determine the normal range of square wave jerks (SWJ) and saccades per minute under different EOG testing conditions.

Main Methods:

  • Fifty normally sighted young subjects participated.
  • Horizontal EOG was performed under three conditions: with a fixation point, in darkness, and with eyes closed.
  • The number of square wave jerks (SWJ) and saccades per minute were quantified.

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Main Results:

  • Square wave jerks (SWJ) were detected in all tested conditions.
  • The highest frequency of SWJ per minute occurred in darkness and with eyes closed.
  • A range of normalcy was established for these EOG conditions.

Conclusions:

  • The study provides normative data for SWJ and saccades in standard EOG testing.
  • Increased SWJ in darkness and with eyes closed are within normal limits.
  • These findings aid in inferring potential pathology from EOG results.