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Under the treatment, patients are exposed directly to full-spectrum bright light. The patient either sits down, if a light box is utilized as the source, or has some degree of mobility if a light visor is used. The duration of the exposure depends on the seriousness of the condition, reduction or elimination of the symptoms and light strength. Depression is 1 condition that is eliminated through the therapy. The affected people biological clock, or the natural course of ones waking and sleeping hours, is gradually normalized following light therapy. The method involves gradually increasing the time exposed to a high-intensity fluorescent lamp from about 30 minutes up to about 2 hours each and every morning the time when the therapy is said to be most effective. Seasonal affective disorder is really a sort of depression caused by the absence of or limited exposure to sunlight during fall and winter. The use of light therapy has been cited by up to 90% of people with SAD as useful in making them feel better, possibly due to the fact the treatment takes the place of sunlight exposure. SAD symptoms could take as long as 3 weeks before they are relieved by way of the therapy.
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