Vigabatrin-induced visual dysfunction in Chinese patients with refractory epilepsy.

Area of Science:

• Ophthalmology
• Neurology
• Pharmacology

Background:

• Bilateral visual field constriction is a known risk associated with vigabatrin, an antiepileptic drug.
• Limited data exist on vigabatrin's retinal toxicity in Asian populations.

Purpose of the Study:

• To investigate the ophthalmologic findings in Chinese patients using vigabatrin.
• To determine the incidence of visual field defects in this population.

Main Methods:

• Ophthalmologic examinations were conducted on Chinese patients with refractory epilepsy, comparing vigabatrin users to a control group on other antiepileptic drugs.
• Methods included visual acuity testing, intraocular pressure measurement, slit lamp biomicroscopy, and automated perimetry.

Main Results:

• Fifty-five point six percent (55.6%) of vigabatrin users (n=18) exhibited significant bilateral visual field defects, predominantly concentric.
• No visual field defects were observed in the control group.
• Treatment duration ranged from 13 months to 5 years with a mean daily dosage of 1581 mg.

Conclusions:

• A high prevalence of visual field constriction was confirmed in Chinese patients using vigabatrin.
• Novel techniques like retinal nerve fiber layer thickness measurement may reveal earlier retinal damage.
• Routine visual field monitoring is advised for patients on long-term vigabatrin therapy.