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  AliIrshad6 months ago

  Due to the thinning of the ozone layer today the intensity of the uva and uvb light has been increased a lot in sun light. In most of the skin condition like skin cancer, psoriasis, Vitiligo, lupus and acne a little or more involvement has been found of these rays.
  
  Ultra violet radiation are the invisible part of the sun light. Normally these rays are block on the upper layer of the atmosphere by the Ozone layer. But the in these days due the environmental pollution these protecting Ozone(O3) layer has been weaken enough to block uvb radiations.
  
  UV radiation are further subdivided into sub categories based on their wave length.
  Regarding skin care two type of uv light that is uva and uvb rays are more important.
  
  UVA
  
  Wave length Range: 320 to 400 nm
  Density of uva rays are sufficient in sunlight. These can infiltrate into the skin these not directly alter skin cells but through some certain way damage DNA. Indirect and become a prominent source of malignant Melanoma. A latest PUVA technology is based on the uva light which we uses the some sensitizing agent for treating some serious disorders like Vitiligo, Psoriasis and Eczema etc.
  
  UVB
  
  Wave length Range: 290 to 320 nm
  These has lower wave length and higher frequency. Most harmful form of ultra violet radiations. A sound factor behind skin cancer. Thousand of products in the market has been to save the skin from the skin cancer by neutralize these rays.
  
  The intensity of the uvb are in its peak in extreme sun hours. UVB normally affects the upper surface of the skin and this is the reason of sun burning in this time.
  
  UVB is also used in treatment of many skin disorder and many medical association have developed special instrument which used in this regard.
  
  PUVA
  Psoralens substance has been used to sensitized human skin after then affected part of the patient skin are exposed to a device which emits uva radiations. Effectiveness of uva far more increase due the psoralens. This technique is successfully being applied for many skin disorder.
  
  Thanks for some technical info about uvb and uva in terms of their impact on human skin the major source of info http://www.antivitiligo.com/vitiligo-treatment/uvb...

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