PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Phototherapy. Woman reading a book as she undergoes phototherapy in front of a light screen. Phototherapy is used to treat jet lag and Seasonal Affective Disorder (SAD). SAD causes depression and withdrawal in winter months, as daylight time 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.
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