DO THE LIGHTS STIMULATE VITAMIN D PRODUCTION? IS THAT THE KEY TO THE ANTIDEPRESSANT EFFECT?
They should not do so using an ultraviolet-screened light box, as recommended. Small amounts of outdoor light (with UV) stimulate adequate skin production of Vitamin D, although less so in winter in the north. If Vitamin D is an issue, supplement capsules are a solution. Unlike Vitamin D production, light therapy works through the eyes, not the skin. WHEN ARE THE LIGHTS CONTRAINDICATED? There are no specific contraindications except in the case of degenerative retinal diseases. As a precaution, patients with ocular pathology should proceed only with concurrence of their ophthalmologist and a schedule of periodic eye exams. Most drug phototoxicity stems from exposure to ultraviolet (UV) light, which is not a problem when using a UV-screened light box. Several drugs (for example, antiarrhythmic medications used to control irregular heartbeat), have been shown to photosensitize to intense visible light, mainly short-wavelength blue irradiation. Caution is warranted in such cases. ARE THE
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