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Definition
By Mayo Clinic staffLight therapy is a way to treat seasonal affective disorder, depression and certain other conditions by exposure to bright artificial light. During light therapy, you sit or work near a device called a light therapy box. The light therapy box gives off bright light that mimics natural outdoor light.
Exposure to bright light from a light therapy box is thought to alter your circadian rhythms and suppress your body's natural release of melatonin. Together, these cause biochemical changes in your brain that help reduce or control symptoms of seasonal affective disorder and other conditions. Light therapy is also known as bright light therapy or phototherapy.
Why it's done
References
- Morgan AJ, et al. Self-help interventions for depressive disorders and depressive symptoms: A systematic review. Annals of General Psychiatry. 2008;7:13.
- Glickman G, et al. Light therapy for seasonal affective disorder with blue narrow-band light-emitting diodes (LEDs). Biological Psychiatry. 2006;59(6):502-507.
- Desan PH, et al. A controlled trial of the Litebook light-emitting diode (LED) light therapy device for treatment of seasonal affective disorder (SAD). BMC Psychiatry. 2007;7:38.
- Lurie SJ, et al. Seasonal affective disorder. American Family Physician. 2006;74(9): 1521-4.
- Byrne B, et al. Seasonal affective disorder and light therapy. Sleep Medicine Clinics. 2008;3:307-315.
- Even C, et al. Efficacy of light therapy in nonseasonal depression: A systematic review. Journal of Affective Disorders. 2008;108(1-2):11-23.
- Rosenthal NE. Winter Blues: Everything You Need to Know to Beat Seasonal Affective Disorder. Rev. ed. New York, N.Y.: Guilford Press; 2006:113-165.
