Mitochondrial dehydrogenase (WST-1) assay for rat embryonal neurosensory precursor retinal cells exposed to benzyl alcohol (BA). After 2, 6, or 24 hours, cells exposed to BA at concentrations equivalent to 0.25, 0.5, or 1.0 mg/mL had a significant reduction in mitochondrial activity when compared to untreated controls (P<.001).