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Ratings of (A) perceived exertion (RPE), (B) discomfort, and (C) mental strain during walking fully sighted in light (Light), in complete darkness using monocular (Mono) or binocular (Bino) NVG, or in complete darkness using blindfold (Dark). Median values are presented, and the error bars indicate the maximum value for each condition. * indicate a statistical difference between conditions.
