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Measuring the Pupillary Light Reflex Using Portable Instruments in Applied Settings.

Nicola S Gray1,2, Menna Price1, Jennifer Pink1

  • 1Department of Psychology, Swansea University, Swansea SA2 8PP, UK.

Vision (Basel, Switzerland)
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

Portable pupillometry devices reliably measure the pupillary light reflex (PLR) in field settings. These tools can assess parasympathetic nervous system health and individual differences, showing correlations with age, anxiety, and PTSD.

Keywords:
ageanxietyparasympathetic nervous systempupillometrytrauma

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Area of Science:

  • Neuroscience
  • Physiology
  • Medical Devices

Background:

  • The parasympathetic nervous system regulates the pupillary light reflex (PLR).
  • Portable pupillometry offers potential for field assessment of parasympathetic health.

Purpose of the Study:

  • To evaluate the reliability and sensitivity of two portable pupillometry devices for measuring PLR parameters in field settings.
  • To assess the influence of individual differences (age, anxiety, PTSD) on PLR measurements.

Main Methods:

  • Measured PLR parameters (baseline diameter, latency, amplitude, velocity) in 108 participants using a commercial pupillometer and an iPhone app.
  • Assessed individual differences in age, anxiety, and PTSD symptomology.
  • Conducted measurements in various field environments.

Main Results:

  • High reliability for most PLR parameters, except iPhone's contraction latency.
  • Internal relationships of PLR parameters mirrored laboratory findings.
  • Age negatively correlated with reliable PLR parameters; anxiety and PTSD effects were observed.

Conclusions:

  • Hand-held portable pupillometers can successfully measure PLR parameters in field settings.
  • These devices can be utilized for assessing parasympathetic activity and individual differences in diverse environments like workplaces and roadsides.