Feasibility of Home-Based Intermittent 60Hz Light Therapy for Major Depressive Disorder (MDD)

Inclusion Criteria: * Age between 24 and 65 years (inclusive)\*. * Confirmed diagnosis of Major Depressive Disorder (MDD), based on MINI interview. * Hamilton Depression Rating Scale (HDRS-17) score ≥17 at screening. * On a stable dose of antidepressant medication for at least 30 days prior to HDRS-17 screening. * No evidence of premorbid cognitive impairment, as demonstrated by a standard score \>85 on the WRAT-5 Reading Recognition Subtest. * Confirmed access to a local provider that has primary responsibility for the subjects' clinical care, and who is available for contact in case of increased subject risk due to depressive symptoms. * Able to provide informed consent and comply with study procedures. * Access to a quiet space suitable for home-based light stimulation sessions. * English speaking: All study materials and assessments are only validated in English Exclusion Criteria: * Presence of primary neurological or autoimmune disorders. * Presence of psychiatric comorbidities as determined by the MINI interview (e.g., anxiety disorders, OCD, PTSD, bipolar disorder, psychotic disorder). * Current or recent diagnosis of alcohol or substance use disorder. * History of bipolar disorder or any psychotic disorder. * Clinically significant suicidal ideation or behavior, based on clinician judgment and the Columbia-Suicide Severity Rating Scale (C-SSRS). * History of seizure disorder or epilepsy. * History of migraine, tinnitus, or photosensitivity. * Diagnosis of retinal disease, cataract, or other visual impairments that may interfere with light exposure. * Regular use of anti-inflammatory drugs or anticoagulants (e.g., clopidogrel). * Pregnancy and Breastfeeding: Currently pregnant, planning pregnancy during the study period, or breastfeeding