Inclusion Criteria (patients with visual impairment)  Aged 18-80; People with glaucoma of all different levels and etiologies.  Inclusion Criteria (healthy controls)  Aged 18-80; Gender neutral: male or female.  Exclusion Criteria (patients with visual impairment & healthy controls)  Significant cognitive dysfunction (score <24 on Folsteins' Mini Mental Status Examination) Previous neurological illness or psychiatric disorders, or suffer from a heart condition or other serious medical conditions Significant mobility restrictions; people using walkers and wheelchairs Pregnancy Elderly Seizures (people who previously have had a seizure, loss of awareness, or other symptom linked to an epileptic condition) Interference with medical devices (the headset and controller(s) may contain magnets or components that emit radio waves, which could affect the operation of nearby electronics, including cardiac pacemakers, hearing aids, and defibrillators)