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Journal of Environmental and Public Health
Volume 2012 (2012), Article ID 784390, 7 pages
http://dx.doi.org/10.1155/2012/784390
Research Article

Psychophysical Evaluation of Achromatic and Chromatic Vision of Workers Chronically Exposed to Organic Solvents

1Instituto de Ciências Biológicas, Universidade Federal do Pará, 66075-110 Belém, PA, Brazil
2Núcleo de Medicina Tropical, Universidade Federal do Pará, 66055-240 Belém, PA, Brazil
3Instituto de Psicologia, Universidade de São Paulo, 05508-030 São Paulo, SP, Brazil
4Núcleo de Neurociências e Comportamento, Universidade de São Paulo, 05508-030 São Paulo, SP, Brazil

Received 16 July 2011; Accepted 19 September 2011

Academic Editor: Gerry Schwalfenberg

Copyright © 2012 Eliza Maria da Costa Brito Lacerda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The purpose of this paper was to evaluate achromatic and chromatic vision of workers chronically exposed to organic solvents through psychophysical methods. Thirty-one gas station workers (31.5 ± 8.4 years old) were evaluated. Psychophysical tests were achromatic tests (Snellen chart, spatial and temporal contrast sensitivity, and visual perimetry) and chromatic tests (Ishihara's test, color discrimination ellipses, and Farnsworth-Munsell 100 hue test—FM100). Spatial contrast sensitivities of exposed workers were lower than the control at spatial frequencies of 20 and 30 cpd whilst the temporal contrast sensitivity was preserved. Visual field losses were found in 10–30 degrees of eccentricity in the solvent exposed workers. The exposed workers group had higher error values of FM100 and wider color discrimination ellipses area compared to the controls. Workers occupationally exposed to organic solvents had abnormal visual functions, mainly color vision losses and visual field constriction.