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Experimental exposure of four volunteers to 40-50 mg/m3 of N,N-dimethylethylamine for eight hours caused irritation of the mucous membrane of their eyes, subjective visual disturbances (haze), and slight edema of the corneal epithelium (Stählbom et al., 1991). The thickness of the cornea showed a very slight but consistent increase in all four subjects at these exposures and in two subjects exposed to 10 mg/m3 but without dose-response. The effects faded within one to three hours after the end of the exposure. Concentrations of 80 and 160 mg/m3 for 15 minutes caused eye irritation but no visual disturbances or corneal edema. Occupational exposure for eight hours to about 25 mg/m3 of N,N-dimethylethylamine (with peaks above 100 mg/m3) was also associated with eye irritation, haze, and corneal edema. The authors believed that the divergence between their findings and other reports in which visual disturbances occurred at lower concentrations during occupational exposure may be due to peak concentrations.