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. https://www.roneverhart.com/Gibson-SG-Supreme-Electric-Guitar-Fireburst-p25297/