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Broadband polychromatic light (white light) and LED radiation can only penetrate 0.0017 mm to 5 mm of tissue. [24] For example, research shows that at wavelengths of 450 nm and 650 nm only 1% of the light reaches approximately 1.6 mm and very little reaches 5 mm. [25] [26] Only laser radiation can propagate into deeper tissues.
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, and skin wound infections.
Many popular red light therapy and LED devices utilize the benefits of both red and infrared light. "Red light focuses on cell turnover in the dermis and epidermis, addressing skin tone, texture ...
While blue light therapy has similar mechanisms for skin enhancement as red light therapy, its usage for photodynamic therapies in treating cancer are slightly different. Blue light therapy stimulates immune system defences, destroys blood vessels that help cancer cells grow, and causes cell death by reacting with oxygen. [16]
Red light therapy exposes the skin to low levels of red or near-infrared light energy, Dr. Mary Stevenson, a dermatologist and skin cancer surgeon at NYU Langone Health, tells TODAY.com.
Photodynamic therapy ( PDT) is a form of phototherapy involving light and a photosensitizing chemical substance used in conjunction with molecular oxygen to elicit cell death ( phototoxicity ). [ 1] PDT is used in treating acne, wet age-related macular degeneration, psoriasis, and herpes. It is used to treat malignant cancers, [ 2] including ...
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