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Familial voluntary nystagmus.

Birte Neppert¹, Holger Rambold

¹Department of Ophthalmology, University Hospital, Lübeck, Germany. bneppert@ophtha.mu-luebeck.de

|June 9, 2006

Summary

Voluntary nystagmus characteristics appear family-specific. Plus-lenses may help prevent involuntary nystagmus by reducing convergence impulse.

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Area of Science:

Ophthalmology
Genetics
Neuroscience

Background:

Voluntary nystagmus, an unusual eye movement, has not been extensively studied for its pathological significance or familial occurrence.
Understanding the genetic and physiological underpinnings of voluntary nystagmus is crucial for diagnosing and managing related visual disturbances.

Observation:

Two families were evaluated using advanced techniques including video, search-coil, and electronystagmography (ENG).
Members across three generations in one family and a child in another demonstrated the ability to generate horizontal voluntary nystagmus.
Specific parameters like duration, amplitude, and frequency of the nystagmus varied between individuals and families.

Findings:

The nystagmus in the first family showed consistent characteristics (2-5s duration, 1-4° amplitude, ~15 cycles/sec frequency).
In the second family, a patient with esotropia and hyperopia produced nystagmus (5° amplitude, 10 cycles/sec, up to 20s duration) that also occurred involuntarily during reading, causing oscillopsia.
Corrective lenses (+0.75 diopters) eliminated the involuntary nystagmus during near fixation in this patient.

Implications:

The parameters of voluntary nystagmus seem to be inherited and family-specific.
Prescribing plus-lenses can be an effective strategy to mitigate involuntary nystagmus by reducing the convergence impulse.
Further research into the genetic and neurological basis of voluntary nystagmus is warranted.

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