Photomedicine and Stem Cells - Michael R. Hamblin - Bog

Janus, the ancient Roman god depicted with two faces is an appropriate metaphor for light therapy. In the right photodynamic therapy conditions, light is able to kill nearly anything that is living. On the opposite face, light of the correct wavelength and proper dose can heal, regenerate, protect, revitalize and restore. This book discusses both sides of Janus' face in regards to light therapy.