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Dating with psoriasis

Light therapy—or phototherapy, classically referred to as heliotherapy—consists of exposure to daylight or to specific wavelengths of light using polychromatic polarised light, lasers, light-emitting diodes, fluorescent lamps, dichroic lamps or very bright, full-spectrum light.

Ultraviolet radiation is known to suppress the immune system and reduce inflammatory responses.Light therapy for skin conditions like psoriasis usually use NB-UVB (311 nm wavelength) though it may use UV-A (315–400 nm wavelength) or UV-B (280–315 nm wavelength) light waves.UV-A, combined with psoralen, a drug taken orally, is known as PUVA treatment.In UVB phototherapy the exposure time is very short, seconds to minutes depending on intensity of lamps and the person's skin pigment and sensitivity.The time is controlled with a timer that turns off the lamps after the treatment time ends.One percent of the population suffer from vitiligo, and narrowband UVB phototherapy is an effective treatment."NB-UVB phototherapy results in satisfactory repigmentation in our vitiligo patients and should be offered as a treatment option." According to the American Cancer Society, there is some evidence that ultraviolet light therapy may be effective in helping treat certain kinds of skin cancer, and ultraviolet blood irradiation therapy is established for this application.However, alternative uses of light for cancer treatment – light box therapy and colored light therapy – are not supported by evidence.Studies show that light therapy helps reduce the debilitating and depressive behaviors of SAD, such as excessive sleepiness and fatigue, with results lasting for at least 1 month.Light therapy is preferred over antidepressants in the treatment of SAD because it is a relatively safe and easy therapy.A 2008 systematic review concluded that "overall, bright light therapy is an excellent candidate for inclusion into the therapeutic inventory available for the treatment of nonseasonal depression today, as adjuvant therapy to antidepressant medication, or eventually as stand-alone treatment for specific subgroups of depressed patients." In the management of circadian rhythm disorders such as delayed sleep phase disorder (DSPD), the timing of light exposure is critical.

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