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Eye movement abnormalities in stiff person syndrome
John R Economides1, Jonathan C Horton
1Beckman Vision Center, University of California, San Francisco, CA 94143-0730, USA.
Neurology
|November 9, 2005
Summary
Stiff person syndrome (SPS) can cause primary ocular motor dysfunction, including nystagmus and impaired eye movements. This suggests GABA depletion may underlie these neurological symptoms in SPS patients.
Area of Science:
- Neurology
- Ophthalmology
Background:
- Stiff person syndrome (SPS) is a rare neurological disorder characterized by muscle rigidity and spasms.
- Ocular motor abnormalities are not typically considered a primary feature of SPS.
Observation:
- A 38-year-old woman with SPS presented with significant ocular motor deficits.
- These included gaze-holding nystagmus, limited abduction, vertical/horizontal misalignment, poor smooth pursuit, and saccade initiation impairment.
Findings:
- The patient's ocular motor abnormalities were not attributable to ocular myasthenia.
- This suggests that primary SPS pathology can directly affect ocular motor control.
Implications:
- Ocular motor dysfunction may be an underrecognized manifestation of Stiff Person Syndrome.
- GABAergic system dysfunction is implicated as a potential cause of these neurological symptoms.