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Related Experiment Videos

Voluntary nystagmus associated with accommodation spasms.

M Sato1, T Kurachi, M Arai

  • 1Department of Ophthalmology, Nagoya University School of Medicine, Japan.

Japanese Journal of Ophthalmology
|April 10, 1999
PubMed
Summary

This study describes a unique case of voluntary nystagmus in a 10-year-old girl, featuring horizontal, vertical, and rotational eye movements alongside accommodation spasms. The condition caused intermittent blurred vision and headaches.

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Area of Science:

  • Ophthalmology
  • Neuroscience

Background:

  • Voluntary nystagmus is a recognized, benign eye movement initiated by conscious effort.
  • Typically, it presents as rapid, conjugate, and primarily horizontal oscillations.

Observation:

  • A 10-year-old Japanese girl presented with symptoms suggestive of voluntary nystagmus.
  • Her chief complaints included intermittent blurred vision, headaches, and eye soreness, linked to the nystagmus and accommodation spasms.

Findings:

  • The nystagmus exhibited a pendular waveform with a frequency of 13-15 Hz and amplitude of 3-5 degrees.
  • Scanning laser ophthalmoscopy revealed horizontal, vertical, and torsional components.
  • Refraction varied significantly (-0.5 D to -5.5 D), with accommodometer readings reaching -12.0 D during nystagmus.

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Implications:

  • This case may represent a unique variant of voluntary nystagmus.
  • The association with accommodation spasms suggests a complex interplay between voluntary eye control and focusing mechanisms.
  • Further observation is ongoing without active treatment.