Brain Stimulation Effects on Orientation and Mobility Skills in Adults With Vision Impairment

Inclusion Criteria: * Are healthy, capacitated adults with binocular constricted visual field loss (due to either retinitis pigmentosa (RP), rod-cone dystrophy, or advanced glaucoma) resulting in functional vision losses. These individuals with visual impairments can be those who have been previously trained by an Orientation and Mobility (O\&M) specialist to independently travel with the long white cane daily (since the length of the white cane and tip at the base are based on personal preference, they should be willing to use their own white cane for the study), and those who do not necessarily use a cane for travelling. * Have binocular visual acuity or best corrected binocular visual acuity no better than 6/12 or 20/40 or +0.30 logMAR (inclusive) with no eccentric viewing, and visual fields no better than 70 degrees in total in each eye. * Are over the age of 18 (inclusive) and has full legal capacity to provide informed consent. * Have read and fully comprehends the information in the consent letter. * Are willing and capable of adhering to instructions and maintaining the outlined appointment schedule. Exclusion Criteria: * Are involved in other recent eye-related studies, either clinical or research-related. To be eligible they would have to wait at least one week for studies not involving brain stimulation, and four weeks for studies in which they receive brain stimulation before they could participate in this study. * Have been diagnosed with dementia or self-repo…