• Light therapy, effective for treating depression, especially Seasonal
Affective Disorder (SAD), works by regulating the biological clock
through exposure to bright light. To maximize its benefits, sit under
the light box for 1-2 hours a day, positioned 12-17 inches away and
at a 45-degree angle. Morning light is best, as afternoon exposure
can disrupt mood. Results usually take 2-4 weeks but may appear in
just a few days.
• For bipolar depression, light therapy is effective but can occasionally
trigger manic symptoms. To reduce this risk, limit use to midday,
starting with 15 minutes and gradually increasing time each week. If
manic symptoms occur, reduce exposure and consult your provider.
• Start light therapy at least two weeks before expecting a seasonal dip
in mood, and gradually decrease the therapy in spring. Common side
effects include headaches and eye strain, and to protect your eyes,
ensure the box has a UV filter and avoid direct light exposure.
• SAD typically begins between ages 15-30, affecting about 5% of
Americans, with milder forms affecting up to 20%. For those with
bipolar disorder, the increased light in March can trigger mania, so
stopping light therapy in February may be necessary. Using blue-
light filtering glasses in the evening can help reduce this risk.
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