Eye movements are intrinsic to moving and doing normal living activities. But eye movements are also the window to spine function too. Because head-eye-neck-upper limb movements are wired together via the Tectospinal tract when eye movements lose their smoothness, accuracy, speed. If there is a breakdown in the reflex head and eye movements known as the vestibular ocular reflex or volitional movements such as smooth pursuit, saccades etc, this can cause neck pain, headaches, shoulder pain etc. This occurs with a breakdown in proprioception which is how the spine and head moves in relationship to the vestibular and eye movement systems .
Concussion is a significant injury that can go undetected and can have life long effects if untreated. The ability to detect abnormal eye movements is extremely difficult without eye tracking equipment https://www.medscape.com/viewarticle/840959. Using RightEye https://www.righteye.com eye tracking equipment and being able to detect deficient eye movements has been an extraordinary eye opener (excuse the pun) but being able to see how a patients eye move and then being able to apply a treatment and see changes is inspiring.
Treatment interventions using head-eye and vestibular movements as well as interactive metronome exercises are aimed at decreasing the concussion symtpoms of being unsteady, visual disturbances, and coordinated movements. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5572417/