Summary
This thesis demonstrates that red and cyan light have opposite pupillary effects compared to blue and green light, suggesting potential for targeted lighting interventions to treat jet lag or reduce evening light's circadian disruption. Ambulatory EEG and light measurements further show that greater daytime light exposure is associated with deeper, higher-quality sleep, supporting the practical design principle of bright days and dim evenings.
Key Findings
- Red and cyan light produce opposite pupil constriction responses compared to blue and green light, implying colour-opponent circadian effects potentially useful for jet lag treatment and evening light management.
- Humans who exposed themselves to more light during the day achieved deeper and better sleep, as measured with ambulatory EEG.
- Combined colour and intensity information provides a more accurate circadian time-of-day signal than either factor alone, suggesting human circadian clocks may integrate both cues similarly to mice.
- A method was developed to characterise individual biological clock properties using ambulatory light reception measurements, enabling personalised circadian assessments.
Categories
Sleep & Circadian Health: Investigates how light intensity and colour affect circadian entrainment, sleep quality, and melatonin-related biological clock synchronisation.
The Science of Light: Examines melanopsin-driven pupillary light reflex as a proxy for circadian photoreception, including colour opponency and spectral sensitivity in humans.
Eye Health & Vision: Uses pupil constriction responses to different light colours to infer circadian clock sensitivity, bridging visual and non-visual photoreception.
Author(s)
T Woelders
Publication Year
2018
Number of Citations
1
Related Publications
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 twoâprocess 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
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice
Eye Health & Vision
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Genetic reactivation of cone photoreceptors restores visual responses in retinitis pigmentosa
- Melanopsin and rodâcone photoreceptors play different roles in mediating pupillary light responses during exposure to continuous light in humans
- Characteristic patterns of dendritic remodeling in early-stage glaucoma: evidence from genetically identified retinal ganglion cell types
- Intrinsically photosensitive melanopsin retinal ganglion cell contributions to the pupillary light reflex and circadian rhythm