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In page Light therapy:

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Light therapy is used to treat cases of neonatal jaundice.[1] Bilirubin, a yellow pigment normally formed in the liver during the breakdown of old red blood cells, cannot always be effectively cleared by a neonate’s liver causing neonatal jaundice. Accumulation of excess bilirubin can cause central nervous system damage, and so this buildup of bilirubin must be treated. Phototherapy uses the energy from light to isomerize the bilirubin and consequently transform it into compounds that the newborn can excrete via urine and stools. Bilirubin is most successful absorbing light in the blue region of the visible light spectrum, which falls between 460-490 nm.[2] Therefore light therapy technologies that utilize these blue wavelengths are the most successful at isomerizing bilirubin.[3]