page_title: Neurological pupil index
section_title: Pupillary evaluation
hierarchical_section_title: Neurological pupil index / Pupillary evaluation
caption_attribution_description: English: Reflex is the world's first commercially available mobile pupillometer.
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: Pupillary evaluation involves the assessment of two components—pupil size and reactivity to light.
  Pupil size is traditionally measured using a pupil gauge to estimate the diameter in millimeters of the pupil at rest before any light is shone into the eye—pupils should be of similar size. Manual measurement is subjective and prone to error.
  Pupil light reactivity is evaluated by shining a light into a patient's eye to make the pupil constrict in reaction to the light. The pupil should dilate again when the light is moved away. The pupil's reaction is numerically graded, typically on scales from one to three, to translate how brisk the pupillary reflex is. These terms are subjective and applied without a standard clinical protocol or definition.
caption: Reflex - PLR Analyzer Screenshot
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