page_title: Neurological pupil index
section_title: Interpreting Scoring
hierarchical_section_title: Neurological pupil index / Interpreting Scoring
caption_attribution_description: English: NeurOptics, Inc. NPi Scale Screenshot
context_page_description: Clinicians routinely check the pupils of critically injured and ill patients to monitor neurological status. However, manual pupil measurements have been shown to be subjective, inaccurate, and not repeatable or consistent. Automated assessment of the pupillary light reflex has emerged as an objective means of measuring pupillary reactivity across a range of neurological diseases, including stroke, traumatic brain injury and edema, tumoral herniation syndromes, and sports or war injuries. Automated pupillometers are used to assess an array of objective pupillary variables including size, constriction velocity, latency, and dilation velocity, which are normalized and standardized to compute an indexed score such as the Neurological Pupil index or Reflex Score.
context_section_description: Each scoring index measurement taken is rated on a scale ranging from 0 to 5. A score equal to or above 3 means that the pupil measurement falls within the boundaries of normal pupil behavior as defined by the NPi and Reflex Score models. However, a value closer to 5 is more like the normal data (NPi) or baseline test (Reflex Score) than a value closer to 3. An NPi score below 3 means the reflex is abnormal, i.e., weaker than a normal pupil response, and values closer to 0 are more abnormal than values closer to 3.
caption: Neurological Pupil index™ (NPi®) Pupil Reactivity Assessment Scale (NeurOptics, Inc.)
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