Analysis of variance and the Kruskal-Wallis test (nonparametric variables) will be used for the analysis of the effects obtained in the three phases of the study. The Bonferroni correction for multiple comparisons will be employed as a post hoc test. The analyses of the three phases will be performed considering spatiotemporal gait variables, Gait Variable Scores, TUG, variables related to displacement of the center of pressure (area of displacement, displacement velocity, anteroposterior sway and mediolateral sway) as the dependent variables. The fixed independent variables in Phase I will be group (congenital and acquired blindness) and auxiliary resource (with and without guide stick). Phase II, the fixed independent variables will be group (tDCS over the somatosensory, tDCS over the primary motor cortex and tDCS over the visual cortex) and evaluation time (pre-tDCS and post-tDCS). In Phase III, the fixed independent variables will be group (active and sham tDCS), evaluation time (pre-intervention, post-intervention and follow up) and group*evaluation time interaction. For all effects, a p-value < 0.05 will be considered indicative of statistical significance.