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Related Experiment Videos

Ocular flutter induced only by optokinetic stimulation.

S H Koh1, S H Kim

  • 1Department of Neurology, College of Medicine, Hanyang University Hospital, Hangdang-dong 17, Seongdong-gu, Seoul 133-792, Korea.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|May 9, 2006
PubMed
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Ocular flutter (OF), involuntary eye oscillations, was observed only during optokinetic stimulation in a patient with olivopontocerebellar atrophy (OPCA). This suggests specific neural pathway involvement in OPCA-related OF.

Area of Science:

  • Neuro-ophthalmology
  • Neurodegenerative diseases

Background:

  • Ocular flutter (OF) is characterized by involuntary horizontal oscillations around the fixation point.
  • Previous reports on OF have not described its development solely from viewing moving objects.

Observation:

  • A 65-year-old man diagnosed with olivopontocerebellar atrophy (OPCA) presented with dizziness and oscillopsia.
  • These symptoms occurred exclusively during specific eye movements, particularly optokinetic stimulation (OKS).

Findings:

  • Electro-oculography revealed decreased pursuit gain, catch-up saccade velocity, and saccade velocity.
  • Ocular flutter was induced only by OKS exceeding 40 degrees/second.

Implications:

  • This case highlights a novel presentation of OF triggered exclusively by OKS in OPCA.

Related Experiment Videos

  • Potential causes include partial loss of omnipause neurons or abnormal burst neuron firing, particularly those linked to optokinetic pathways.