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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Binasal visual field defects are not specific to vigabatrin.

Pedro Gonzalez1, Graeme J Sills, Stuart Parks

  • 1Tennent Institute of Ophthalmology, Gartnavel General Hospital, Glasgow, Scotland, UK.

Epilepsy & Behavior : E&B
|October 10, 2009
PubMed
Summary

Vigabatrin (VGB), an epilepsy drug, can cause visual defects. Many patients on VGB, even those who previously used it, show visual field constriction and retinal dysfunction.

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Area of Science:

  • Ophthalmology
  • Neurology
  • Clinical Pharmacology

Background:

  • Epilepsy treatment frequently involves antiepileptic drugs (AEDs).
  • Vigabatrin (VGB) is an AED used for epilepsy management.
  • Potential visual side effects of VGB require thorough investigation.

Purpose of the Study:

  • To investigate the prevalence and characteristics of visual defects in patients exposed to vigabatrin (VGB).
  • To compare visual function in current VGB users, previous users, and non-users.
  • To evaluate the sensitivity of standard visual field testing in detecting VGB-induced retinal toxicity.

Main Methods:

  • Cross-sectional study involving 204 epilepsy patients.
  • Grouping based on VGB exposure: current, previous, or no exposure.
  • Objective electrophysiological assessment (multifocal electroretinography) and static perimetry.

Main Results:

  • Bilateral visual field constriction observed in 59% of current VGB users and 43% of previous users.
  • Abnormal retinal function detected in 48% of current VGB users and 22% of previous users.
  • Visual field abnormalities were present even in patients with no VGB exposure, suggesting other factors, but VGB significantly increased risk.

Conclusions:

  • Bilateral visual field abnormalities are common in epilepsy patients, with VGB use increasing their likelihood.
  • VGB is associated with significant retinal dysfunction and visual field defects.
  • Conventional static perimetry may not be sensitive enough to detect early VGB-related retinal toxicity.