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Norman E. Rosenthal is an American author, psychiatrist and scientist who first described seasonal affective disorder (SAD), and developed light therapy as a treatment. Rosenthal was born and educated in South Africa but moved to the United States to complete his medical training.
A 2007 systematic review by the Swedish agency SBU found insufficient evidence that light therapy was able to alleviate symptoms of depression or seasonal affective disorder. [24] The report recommended that: "Approximately 100 participants are required to establish whether the therapy is moderately more effective than placebo". [24]
In recent years, full-spectrum lighting has been used in the treatment of seasonal affective disorder (SAD) through the use of "light boxes" that mimic natural sunlight, which may not be available in some areas during the winter months. Light is an environmental stimulus for regulating circadian cycles.
SAD lamps, or light boxes—which, to be effective, should emit 10,000 lux, the amount of light you’d see on the horizon at sunrise—are widely available in a range of sizes and prices ...
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Light therapy has been shown in studies to have mixed results; in some studies, 20% to 50% of those diagnosed with SAD did not gain adequate relief from the use of light therapy. [22] Individuals may also explore alternative treatments if they are unable to commit to the time required and the recurrence of the treatment that is necessary. [ 23 ]
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