UVB Treatment Why ultraviolet light can be useful Psoriasis sufferers may benefit from exposure to UVB light, one of the three wavebands of ultraviolet light that comes from the sun. Of the three wavebands - UVA, UVB and UVC – the shorter wavelengths in the UVC part of the spectrum are absorbed by the ozone layer and do not reach the earth's surface. The UV light which does reach us is mainly of the longer UVA wavelengths, with some intermediate UVB and it is the UVB rays which are most beneficial to those of us with psoriasis. UV light has many effects on skin and cell function. In psoriasis, at least one of the effects of UV light therapy is that cells do not multiply so rapidly and the anti-inflammatory effects are also import |
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