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Visual evoked potentials in rubber factory workers

O P Tandon1, V Kumar

  • 1Department of Physiology, University College of Medical Sciences, Shahdara, Delhi, India.

Occupational Medicine (Oxford, England)
|January 1, 1997
PubMed
Summary
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Exposure to rubber factory environments significantly impacts optical pathways, with over half of workers showing abnormal pattern reversal visual evoked potentials (pVEP). Specific processes like vulcanization and tubing showed the highest rates of visual pathway abnormalities.

Area of Science:

  • Neuroscience
  • Occupational Health
  • Ophthalmology

Background:

  • Occupational exposure to chemicals in rubber factories may pose risks to visual health.
  • Visual evoked potentials (VEP) are a sensitive tool for assessing the integrity of the visual pathway.

Purpose of the Study:

  • To investigate the effects of rubber factory environments on the visual pathways of workers using pattern reversal visual evoked potentials (pVEP).

Main Methods:

  • pVEP was recorded in 39 male rubber factory workers and 20 age-matched controls.
  • Abnormalities were defined as latencies exceeding the 99% tolerance limit (mean +3 SD) of the control group.

Main Results:

  • 51% of rubber factory workers exhibited abnormal pVEP latencies.

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  • Abnormalities were most prevalent in vulcanization (83%), tubing (75%), and calendering (60%) sections.
  • Lower rates of abnormalities were observed in loading (38%) and mixing (14%) sections.

    • Conclusions:

    • The rubber factory environment demonstrably affects visual pathway conduction from retina to striate cortex.
    • Electrophysiological evidence supports a link between occupational exposure and visual pathway dysfunction.
    • Specific causative chemicals within the rubber factory environment remain unidentified.