Pilot Study of Neurofeedback for Photosensitivity in Mild Traumatic Brain Injury

Inclusion Criteria: * Ages 18-65 * Documented history of mTBI at least 6 months prior to initial study visit * Documented symptoms of photosensitivity * Eye exam within the last 12 months documenting best-corrected acuity of 20/20 or better, normal pupillary function, color vision, no abnormalities on OCT scan, and normal Humphrey Visual Field test Exclusion Criteria: * History of strabismus or amblyopia * Significant ocular media opacity that could reduce the amount of light entering the pupil in one or both eyes * Previous or current history of retinal or optic nerve pathology in one or both eyes * History of stroke and/or visual neglect * History of neurodegenerative disease (e.g., Parkinson's, multiple sclerosis) * History of epilepsy or seizures * History of motor tics * Current use of medications or substances that may severely affect pupillary response and/or increase photosensitivity * Individuals with impaired decision-making capacity * Illiterate or no English language proficiency