Vielight Neuro RX Gamma - Feasibility Pilot

Inclusion Criteria: * Age is greater than or equal to 50 years old * Meets the criteria for probable Alzheimer's disease of the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) * If receiving ongoing cholinesterase inhibitor therapy and/or memantine, must be on a stable dosage for at least the prior 3 months * Mini Mental State Examination (MMSE) score between 0-20 at screening assessment * Severe Impairment Battery score at baseline of ≤90 * Outpatient with a reliable caregiver willing to commit to study visits and procedures Exclusion Criteria: * Current psychiatric or other neurologic disease * Any history of stroke, seizures, light sensitivity (polymorphous light eruption, solar urticaria, persistent light reactivity) or Lyme disease, including those taking photosensitizing medication * Currently undergoing light therapy treatment * Increased skin sensitivity at the treatment site including active herpes simplex in the treatment area, history of keloid formation, or history of retinoid use in the past month * Pregnant or lactating or planning to become pregnant * Any issues with ambulation, vision, or hearing which could, in the opinion of the investigator, interfere with their ability to complete assessments * Does not speak English at a level necessary for the completion of the assessments. * Currently participating in another clinical research study involving an inv…