An electrically-powered unit intended to measure and analyse eye movement to assist in the diagnosis/assessment of a neurological disorder [e.g., autism spectrum disorder (ASD), attention-deficit hyperactivity disorder (ADHD), dementia] or potential traumatic brain injury (e.g., concussion). It includes visual stimuli (e.g., videos) and devices for sensing/tracking eye movement (e.g., infrared cameras), dedicated software for analysing results and providing management guidelines, and a user interface for viewing/input. It is intended to be used by a healthcare professional in a clinical setting. This is a reusable device.