#$%^&*AU2020204136A120200709.pdf#####ABSTRACT A frontal light diffusing device for delivering a predetermined optical irradiance value to a targeted treatment area comprising: i) an optical fiber having a proximal end and a distal termination having a light output face； ii) a collimation lens assembly having a variable aperture that blocks non-central portions of light outcoupled from the light output face, thereby allowing only a central portion of the light to exit through the variable aperture resulting in a flat irradiance distribution which means that the central portion of the light exiting through the variable aperture is a collimated light output having a "top hat" spatial irradiance distribution with less than +/- 20% difference in irradiance between near field, far field, and distance between the near field and the far field 11649326 1 (GHMatters) P110915.AU.11/38 I-* l0 CD C C)
