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Colour vision defects in occupational chronic solvent encephalopathy.

Juha Päällysaho1, Risto Näsänen, Maija Mäntyjärvi

  • 1Brain and Work Research Centre, Finnish Institute of Occupational Health, Topeliuksenkatu 41 aA, FIN-00250, Helsinki, Finland. juha.paallysaho@ttl.fi

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Chronic solvent encephalopathy (CSE) impairs color vision in workers. Even with healthy eyes, patients show significantly reduced color discrimination, suggesting potential brain damage affecting visual processing.

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Area of Science:

  • Neuroscience
  • Occupational Health
  • Ophthalmology

Background:

  • Occupational chronic solvent encephalopathy (CSE) is linked to neurobehavioral issues, including visual perception deficits.
  • Color vision impairment is a potential consequence of solvent exposure.

Purpose of the Study:

  • To characterize and quantify color vision defects in individuals with CSE.
  • To investigate the relationship between occupational solvent exposure and color vision abnormalities.

Main Methods:

  • Farnsworth-Munsell 100-hue test used to assess color vision in bright light.
  • 36 CSE patients with healthy eyes and normal visual functions were selected.
  • Monocular color vision testing was performed and compared to an age-matched control group.

Main Results:

  • CSE patients demonstrated statistically significant inferior color vision compared to controls.
  • A mixed form of reduced color sensitivity was observed in 42% of patients, affecting all Munsell hues.
  • No correlation found between exposure duration/intensity and color vision performance.

Conclusions:

  • CSE is associated with significant color discrimination impairment, even in individuals with healthy eyes and normal visual functions.
  • Findings suggest potential toxic damage to higher-level visual processing centers in the cerebral cortex.
  • Color vision testing can be a valuable tool for detecting neurotoxic effects of solvent exposure.