The optics of blood is required in most areas of advanced optical imaging, laser applications, and biophotonics. Blood supplies practically in every single biological tissue, hence knowing blood properties is critical for all optical applications in diagnostics and therapy. This handbook, written by international leading experts, provides a comprehensive overview of the optics of blood. The topics will include: physiology/morphology of blood via optical microscopy, fundamental optical properties of blood, optical methods of measurement of blood, and applications for diagnostics and therapy of blood using light-based methods.