Changes in the optical properties of the blood plasma under the influence of monochromatic light

It was established experimentally that low-intensity light altered the absorption spectrum of the human blood plasma in the wavelength range 350–550 nm. Violet and green light produced opposite effects. These light-induced changes appeared in a matter of a few seconds, but the relaxation of the spectrum at the end of illumination took tens of minutes. A study was made of the dependences of this effect on the intensity, dose, and wavelength of the incident light. A phenomenological model described qualitatively the experimentally observed effects.