Two experiments are reported that attempt to explore systematically the role of sighting dominance during binocular rivalry. Experiment 1 showed that the sighting eye tends to display longer total viewing time, and experiment 2 indicated that this asymmetry remained even when observers had increased experience with rivalrous stimulation. Additional analysis revealed that the average dominance period of the sighting eye was longer than that of the nonsighting eye, resulting in significant sequencing effects during the rivalry process.