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Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
Seasonal affective disorder (SAD) is a mood disorder subset in which people who typically have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year. [ 1 ] [ 2 ] It is commonly, but not always, associated with the reductions or increases in total daily sunlight hours that occur during the winter ...
Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. [9] The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. [9] Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. [12]
Excessive blue light can cause accelerated aging in flies because this exposure can cause cellular damage, according to a study released Wednesday.
Light therapy, also called phototherapy or bright light therapy is the exposure to direct sunlight or artificial light at controlled wavelengths in order to treat a variety of medical disorders, including seasonal affective disorder (SAD), circadian rhythm sleep-wake disorders, cancers, neonatal jaundice, and skin wound infections.
A form of dark therapy is to block blue wavelength lights to stop the disintegration of melatonin. [3] This dark therapy concept was originated back in 1998 from a research which suggested that systematic exposure to darkness might alter people's mood. [4] Original studies enforced 14 hours of darkness to bipolar patients for three nights straight.
Diurnal mood improvement was associated with activity of dorsal neural networks. Increased mean core temperature was also observed. One hypothesis proposed that depression was a result of a phase shift. [30] Daytime light exposure correlates with decreased serotonin transporter activity, which may underlie the seasonality of some depression. [31]
A mood disorder, also known as an affective disorder, is any of a group of conditions of mental and behavioral disorder [2] where the main underlying characteristic is a disturbance in the person's mood. [3]
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