Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/2417
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Type: Artigo de Periódico
Issue Date: Mar-2007
Authors: RODRIGUES, Anderson Raiol
SOUZA, Cleidson Ronald Botelho de
BRAGA, Alexandre Melo
RODRIGUES, Paulo Sergio Silva
SILVEIRA, Antonio Tobias
DAMIN, Enira Teresinha Braghirolli
CÔRTES, Maria Izabel Tentes
CASTRO, Antonio José de Oliveira
MELLO, Guilherme Arantes
VIEIRA, José Luiz Fernandes
PINHEIRO, Maria da Conceição Nascimento
VENTURA, Dora Selma Fix
SILVEIRA, Luiz Carlos de Lima
Title: Mercury toxicity in the Amazon: contrast sensitivity and color discrimination of subjects exposed to mercury
Citation: RODRIGUES, A.R. et al. Mercury toxicity in the Amazon: contrast sensitivity and color discrimination of subjects exposed to mercury. Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v. 40, n. 3, p. 415-424, mar. 2007. Disponível em: <http://www.scielo.br/pdf/bjmbr/v40n3/6241.pdf> Acesso em: 07 dez. 2011. <http://dx.doi.org/10.1590/S0100-879X2007000300018>.
Abstract: We measured visual performance in achromatic and chromatic spatial tasks of mercury-exposed subjects and compared the results with norms obtained from healthy individuals of similar age. Data were obtained for a group of 28 mercury-exposed subjects, comprising 20 Amazonian gold miners, 2 inhabitants of Amazonian riverside communities, and 6 laboratory technicians, who asked for medical care. Statistical norms were generated by testing healthy control subjects divided into three age groups. The performance of a substantial proportion of the mercury-exposed subjects was below the norms in all of these tasks. Eleven of 20 subjects (55%) performed below the norms in the achromatic contrast sensitivity task. The mercury-exposed subjects also had lower red-green contrast sensitivity deficits at all tested spatial frequencies (9/11 subjects; 81%). Three gold miners and 1 riverine (4/19 subjects, 21%) performed worse than normal subjects making more mistakes in the color arrangement test. Five of 10 subjects tested (50%), comprising 2 gold miners, 2 technicians, and 1 riverine, performed worse than normal in the color discrimination test, having areas of one or more MacAdam ellipse larger than normal subjects and high color discrimination thresholds at least in one color locus. These data indicate that psychophysical assessment can be used to quantify the degree of visual impairment of mercury-exposed subjects. They also suggest that some spatial tests such as the measurement of red-green chromatic contrast are sufficiently sensitive to detect visual dysfunction caused by mercury toxicity.
Keywords: Amazônia brasileira
Mercúrio
Exposição (Poluição)
Mercúrio
População ribeirinha
Toxicologia
Sensibilidade de contraste (Visão)
ISSN: 1414-431X
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - ICB
Artigos Científicos - NMT

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