METHOD
Design
To study acute effects, color vision of eight workers of a
rotogravure was tested before and after cleaning containers
with pure toluene. For control, eight unexposed workers of a
metal-working factory were examined by the same procedure.
To investigate chronic effects, this control group was not suitable,
as there were differences in age, alcohol consumption,
and smoking habits. Therefore, control subjects were taken
from our data bank containing healthy employed persons.