The first therapeutic uses of light (so called light therapy) date back to the end of the twentieth century, when a Danish researcher, Niels Ryberg Finsen, showed that light stimulates the immune defenses and enables the fight against infections. The treatment had two branches: heliotherapy (natural sun therapy) and phototherapy (artificial light therapy). These progressive […]
The post The photographic history of Light Therapy, 1900-1950 appeared first on Rare Historical Photos.
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