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Related Experiment Videos

Cumulative exposure to styrene and visual functions.

L Castillo1, M Baldwin, M P Sassine

  • 1Centre d'étude des interactions biologiques entre la santé et l'environnement (CINBIOSE), Université du Québec à Montreal, Montréal, Québec, Canada.

American Journal of Industrial Medicine
|April 27, 2001
PubMed
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Long-term styrene exposure may cause lasting vision problems. While color vision remained stable, contrast sensitivity declined with cumulative exposure, suggesting neuro-optic pathway damage.

Area of Science:

  • Occupational Health
  • Neuroscience
  • Ophthalmology

Background:

  • A previous study indicated styrene exposure reduction improved color vision but worsened contrast sensitivity.
  • Reinforced plastics plant workers were the initial study cohort.

Purpose of the Study:

  • To re-evaluate visual functions in workers previously studied for styrene exposure.
  • To investigate the relationship between cumulative styrene exposure and visual function changes over time.

Main Methods:

  • 18 workers with good visual acuity were retested in 1999.
  • Cumulative Exposure Index (CEI) was calculated, accounting for respirator use.
  • Mandelic acid (MA) levels and visual functions (color vision, contrast sensitivity) were assessed.

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Main Results:

  • Mandelic acid levels significantly decreased over time but did not correlate with CEI.
  • Color vision showed no significant change between 1992 and 1999.
  • Contrast sensitivity showed a significant decline over time, particularly at intermediate frequencies, and correlated with higher CEI.

Conclusions:

  • Long-term cumulative styrene exposure is associated with progressive loss of contrast sensitivity.
  • The findings suggest chronic damage to the neuro-optic pathways from styrene exposure.
  • Contrast sensitivity may serve as a biomarker for chronic neuro-optic effects of styrene.