Mercury toxicity in the Amazon: contrast sensitivity and color discrimination of subjects exposed to mercury oleh A.R. Rodrigues, C.R.B. Souza, A.M. Braga, P.S.S. Rodrigues, A.T. Silveira, E.T.B. Damin, M.I.T. Côrtes, A.J.O. Castro, G.A. Mello, J.L.F. Vieira, M.C.N. Pinheiro, D.F. Ventura, L.C.L. Silveira