Playing action video games enhances spatial resolution of vision, as shown by experiments measuring crowding, a phenomenon where target identification is impaired by nearby distractors. Action-video-game players (VGPs) could tolerate smaller target-distractor distances compared to non-players (NVGPs), indicating enhanced spatial resolution. This effect was also observed in NVGPs trained on action video games, confirming a causal relationship between video-game play and improved spatial resolution. Experiment 1 demonstrated that VGPs had smaller crowding regions than NVGPs, with performance maintained at separations that hindered NVGPs. Experiment 2 showed that training on an action video game led to significant reductions in crowding thresholds compared to training on a control game, indicating that video-game experience can alter the spatial resolution of vision. These findings suggest that video-game play may enhance fundamental visual processing characteristics, potentially offering applications in visual rehabilitation. The study highlights the potential of action-video-game training for improving visual performance and reducing the effects of crowding, which is a common issue in visually impaired individuals.Playing action video games enhances spatial resolution of vision, as shown by experiments measuring crowding, a phenomenon where target identification is impaired by nearby distractors. Action-video-game players (VGPs) could tolerate smaller target-distractor distances compared to non-players (NVGPs), indicating enhanced spatial resolution. This effect was also observed in NVGPs trained on action video games, confirming a causal relationship between video-game play and improved spatial resolution. Experiment 1 demonstrated that VGPs had smaller crowding regions than NVGPs, with performance maintained at separations that hindered NVGPs. Experiment 2 showed that training on an action video game led to significant reductions in crowding thresholds compared to training on a control game, indicating that video-game experience can alter the spatial resolution of vision. These findings suggest that video-game play may enhance fundamental visual processing characteristics, potentially offering applications in visual rehabilitation. The study highlights the potential of action-video-game training for improving visual performance and reducing the effects of crowding, which is a common issue in visually impaired individuals.