AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Phototherapy. Girl undergoing phototherapy sitting in front of a lightbox. Phototherapy is used to treat jet lag and seasonal Affective disorder (SAD). SAD causes depression and withdrawal in winter months, as daylight tome decreases. By exposing the patient to a strong light source for a few hours each day, the impression of longer daylight hours can be created. Phototherapy may also be used to treat some skin disorders, such as psoriasis, vitiligo or eczema.
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