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hi dearfreinds.iam going to talk about serious side effect of uvr. there are 3types of uvr radiation.uvc 200.290nm wich absorb by ozon and atomospher and not reach the earth.uvb290.320nm  this type reach the earth and affect the epidermis.uva2.320.340nmand uva1.340.400nm.this type reachn the earth and affect the dermis  and can penetrate it.early affect of uvr are tanning.inflamation.hyperplasia and local or systemic immuno suppression..the lat affeects are photo aging.photocarcinogesis and keratitis.

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