Summary
Pupillary light reflex responses to short-wavelength light (460–490 nm) are inversely correlated with circadian system robustness, suggesting that PLR measurements could serve as a non-invasive proxy for assessing circadian health status. This has practical implications for lighting designers and clinicians who could use PLR-based tools to evaluate whether individuals have well-entrained circadian systems before or after lighting interventions.
Key Findings
- Robust circadian rhythms (high stability, low fragmentation, high amplitude, phase advance) were associated with reduced PLR responses to 460–490 nm wavelengths.
- An integrated circadian status index (CSI) and a composite PLR parameter (cp-PLR) showed a significant inverse correlation, demonstrating for the first time a direct link between circadian system robustness and melanopsin-driven pupillary response.
- Nine monochromatic photon-matched stimuli from 420–500 nm were tested in 15 healthy young participants, with PLR compared against wrist temperature rhythms, motor activity, light exposure patterns, and subjective sleep/chronotype questionnaires.
Categories
The Science of Light: Directly investigates the relationship between melanopsin-driven pupillary light reflex (PLR) and circadian system status via ipRGC photobiology and spectral sensitivity.
Sleep & Circadian Health: Correlates PLR parameters with circadian rhythm robustness markers including stability, amplitude, phase, and fragmentation measured via wrist temperature and motor activity.
Author(s)
MA Bonmati-Carrion, K Hild, C Isherwood
Publication Year
2016
Number of Citations
35
Related Publications
The Science of Light
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Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The two‐process model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors