[Light pollution]
Jean-Louis Dufier1, Yvan Touitou2
1Académie nationale de médecin Clinique Roosevelt, Paris, France.
La Revue Du Praticien
|March 15, 2022
Summary
Artificial light, especially blue light from LEDs, damages the retina and disrupts the body clock. This light pollution contributes to retinal degeneration and health issues like breast cancer, particularly in shift workers and adolescents.
Area of Science:
- Ophthalmology
- Chronobiology
- Public Health
Background:
- Artificial light, particularly blue light (380-500 nm) from LEDs, acts as a pollutant detrimental to retinal health.
- Exposure to light at night (LAN) disrupts the metabolic processes of retinal photoreceptors (rods and cones), impacting visual function.
- LAN also affects the intrinsically photosensitive ganglion cells (ipRGSs), which regulate the body's internal clock and melatonin secretion.
Purpose of the Study:
- To elucidate the mechanisms by which artificial light pollution, specifically blue light, causes retinal damage.
- To investigate the impact of LAN on circadian rhythm disruption and its associated health consequences.
- To highlight the public health concerns related to chronic circadian desynchronization.
Main Methods:
- Review of existing literature on the phototoxicity of artificial light on retinal cells.
- Analysis of the effects of LAN on the ipRGSs and their role in circadian regulation.
- Examination of epidemiological data linking LAN exposure to specific health outcomes.
Main Results:
- Photochemical damage to the retinal pigmented epithelium and photoreceptors, exacerbated by blue light, contributes to retinal degenerative diseases like age-related macular degeneration (ARMD).
- LAN inhibits melatonin secretion and causes circadian desynchronization, affecting both visual and non-visual retinal functions.
- Increased incidence of breast cancer in populations exposed to LAN, such as nurses and shift workers, is linked to melatonin inhibition and sleep disruption.
Conclusions:
- Artificial light pollution poses a significant threat to retinal health and is implicated in the pathogenesis of degenerative retinal diseases.
- Circadian desynchronization due to LAN is a major public health concern, affecting shift workers, adolescents, and potentially leading to increased cancer risk.
- Minimizing exposure to artificial light at night, especially blue light, is crucial for preserving retinal health and maintaining circadian rhythm integrity.
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