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Voluntary nystagmus associated with accommodation spasms
1Department of Ophthalmology, Nagoya University School of Medicine, Japan.
Japanese Journal of Ophthalmology
|April 10, 1999
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.
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.
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.