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Related Experiment Videos

Ocular abnormalities in amyotrophic lateral sclerosis

M Ohki1, R Kanayama, T Nakamura

  • 1Department of Otolaryngology, Yamagata University School of Medicine, Japan.

Acta Oto-Laryngologica. Supplementum
|January 1, 1994
PubMed
Summary
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Oculomotor abnormalities, including reduced saccade velocity, may occur in early stages of amyotrophic lateral sclerosis (ALS). These eye movement issues were more common in ALS patients with bulbar signs.

Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • Traditionally, the oculomotor system was considered unaffected in early-stage amyotrophic lateral sclerosis (ALS).
  • Emerging evidence suggests potential oculomotor abnormalities in some ALS patients.

Observation:

  • This study quantitatively analyzed ocular movements in 9 early-stage ALS patients.
  • Eye movements assessed included smooth pursuit, optokinetic nystagmus (OKN), visual suppression of vestibular nystagmus (VS), and horizontal saccades.

Findings:

  • Reduced saccade velocity was observed in 4 patients.
  • Abnormalities in smooth pursuit, OKN, and visual suppression were noted in 1-2 patients each.
  • Ocular abnormalities were more prevalent in ALS patients presenting with bulbar signs.

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Implications:

  • The findings challenge the long-held belief of oculomotor system normality in early ALS.
  • Suggests that ocular movement analysis may aid in early ALS detection.
  • Highlights the potential link between bulbar involvement and oculomotor dysfunction in ALS.