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Binocular saccadic eye movements in multiple sclerosis

J P Flipse1, C S Straathof, J Van der Steen

  • 1Department of Physiology, Faculty of Medicine, Erasmus University Rotterdam, The Netherlands.

Journal of the Neurological Sciences
|May 1, 1997
PubMed
Summary

Researchers developed a new method to detect internuclear ophthalmoplegia (INO) in multiple sclerosis (MS) patients by analyzing saccadic eye movements. This technique improves sensitivity for identifying sub-clinical INOs, aiding in earlier diagnosis and management of MS-related eye conditions.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Internuclear ophthalmoplegia (INO) is an eye movement disorder often associated with multiple sclerosis (MS).
  • Current methods for detecting INO may lack sensitivity, particularly for sub-clinical cases.
  • Abnormal binocular saccadic eye movements are key indicators of neurological conditions affecting eye coordination.

Purpose of the Study:

  • To enhance the sensitivity of detecting abnormal binocular saccadic eye movements, specifically INO, in patients with multiple sclerosis (MS).
  • To differentiate between clinically manifest INO, sub-clinical INO, and normal eye movement patterns in MS patients.

Main Methods:

  • Binocular recording of 10 and 20-degree saccades using scleral sensor coils in 10 healthy controls and 26 MS patients.

Related Experiment Videos

  • Analysis of peak velocities and accelerations of saccades, focusing on adducting and abducting eye movements.
  • Calculation of interocular ratios of peak accelerations and velocities to assess binocular coordination.

    • Main Results:

    • Patients with manifest INO exhibited reduced peak velocities and accelerations, especially during adduction.
    • Interocular ratios of peak acceleration to velocity provided a sharper distinction between normal subjects and INO patients.
    • Sub-clinical INOs were identified in 5 MS patients based on elevated interocular ratios, distinct from 14 patients with normal ratios.

    Conclusions:

    • The acceleration of the adducting eye is significantly reduced in patients with INO.
    • Interocular comparison of binocular saccade pairs, particularly the acceleration ratios, is a sensitive method for identifying INO in MS.
    • This approach can detect sub-clinical INOs, improving diagnostic capabilities for neurological eye movement disorders in MS.