Summary
This study examines how people lacking cone-mediated vision maintain circadian entrainment, isolating the contribution of melanopsin-containing ipRGCs to rest-activity cycles and melatonin timing. The findings have practical implications for lighting design aimed at non-visual (circadian) effects, particularly for populations with certain visual impairments where cone pathways are compromised.
Key Findings
- Individuals without cone-mediated vision can still exhibit circadian entrainment, implicating melanopsin-expressing ipRGCs as sufficient for photoentrainment in the absence of cone input.
- Rest-activity cycles and melatonin phase angles were measurable in achromatopsia or cone-dysfunction patients, suggesting ipRGC-driven pathways alone can sustain circadian photoentrainment at photopic light levels.
Categories
Sleep & Circadian Health: Examines circadian entrainment and melatonin phase angles in individuals without cone-mediated vision, isolating the role of ipRGCs/melanopsin in light-driven circadian rhythms.
The Science of Light: Directly investigates the photoreceptor biology of melanopsin-expressing ipRGCs and their contribution to non-visual light responses independent of cone input.
Author(s)
M Spitschan, C Garbazza, S Kohl, C Cajochen
Publication Year
2020
Number of Citations
2
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 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
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