Inclusion Criteria:  Homonymous hemianopia with or without macular sparing for at least 6 months Visual acuity of at least 20/50 in each eye, with correction if needed Able to walk independently, using a cane or walker if needed  Exclusion Criteria:  Central visual field loss in the seeing hemifield (e.g. from macular degeneration, glaucoma, diabetic retinopathy or other maculopathies) Hemi-spatial neglect Significant cognitive impairment Dementia History of seizures in last 6 months Any other physical or mental disabilities, or general health problems that could impair the ability to be independently mobile (i.e., walk ), participate in the VR walking simulator test or use the prism glasses