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Related Experiment Video

Updated: Dec 14, 2025

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

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Functional positional eye and eyelid movements.

Mohamed Mabrouk Mustafa1,2, Harry Akram3, Manuel Oliva-Domínguez4

  • 1Department of Neuroscience, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan.

Journal of Neurology
|July 17, 2020
PubMed
Summary
This summary is machine-generated.

Functional eye and eyelid movements can mimic or coexist with nystagmus during positional maneuvers. Differentiating these functional movements from organic nystagmus is crucial for accurate neurological diagnosis.

Keywords:
Conversion disorderEye movementsEyelidFunctionalPositionalPsychogenic

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Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • Positional maneuvers are key in neurological exams, especially for vertigo patients.
  • Identifying provoked nystagmus aids in distinguishing central from peripheral neurological disorders.

Purpose of the Study:

  • To describe functional positional eye and eyelid movements.
  • To highlight their potential to complicate the interpretation of positional maneuvers.

Main Methods:

  • A case series approach was utilized.
  • Observed and documented functional eye and eyelid movements during positional maneuvers.

Main Results:

  • Four patients exhibited functional eye and eyelid movements during positional maneuvers.
  • Observed abnormalities included positional convergence spasm, saccadic oscillations, and excessive blinking mimicking nystagmus.
  • These functional movements occurred alongside pre-existing nystagmus or positional vertigo.

Conclusions:

  • Functional positional eye and eyelid movements can coexist with organic nystagmus, challenging accurate interpretation.
  • Understanding differentiating features prevents misdiagnosis and unnecessary investigations.