In summary, we propose to conduct a pilot experiment testing whether visual function in-patients with hemianopic field loss caused by brain injury can be improved by combining transcranial direct stimulation and computer based vision training. We hypothesize that computer based vision training will reinforce visual cortical networks primed by concurrent transcranial direct current stimulation (TDCS) and lead to improved visual performance. The BIDMC investigators will be responsible for TDCS application and VRT, as well as associated data processing / interpretation.