Neonatal Oculomotor, Optomotor, Vestibulo-ocular, Protective Blink, and Pupillary Light Reflexes Following Perinatal Brain Trauma: Implications for Early Visual Rehabilitation in Mild Traumatic Brain Injury and Concussion.

Perinatal brain trauma, including hypoxic-ischemic encephalopathy and mechanical injury during pregnancy, labor, or delivery, represents an early-acquired brain injury that disrupts the identical subcortical, brainstem, cerebellar, and emerging cortical visual, oculomotor, and vestibulo-ocular pathways commonly impaired in mild traumatic brain injury (mTBI) or concussion. This topical review examines five key neonatal reflexes: optomotor (optokinetic nystagmus [OKN], head-turning, fix-and-follow), oculomotor (reflexive saccades, doll's eye), vestibulo-ocular (VOR), pupillary light (PLR including relative afferent pupillary defect and alpha-omega pupil), and protective blink reflexes, as rapid, non-invasive biomarkers of pathway integrity in newborns. These hardwired reflexes, robust at birth but cortically refined by 3-6 months, are highly vulnerable to perinatal trauma; their absence, asymmetry, or failure to mature signals risk for cortical visual impairment and gaze instability that mirror post-concussion symptoms. We highlight syndromic red-flag clusters, behavioral state considerations for testing, and immediate infant-adapted visual rehabilitation strategies (fixation/pursuit training, OKN stimulation, vestibular exercises) during the critical 0- to 6-month sensitive period. By linking neonatal reflex assessment to mTBI rehabilitation frameworks, this review supports proactive, life span-oriented intervention in pediatric neurology and neuro-optometry/ophthalmology.