A feeding tube assembly comprising a feeding tube body and an optical system. The feeding tube body includes an administration lumen and an optical lumen. The optical lumen is isolated relative to the administration lumen, with the distal end opening corresponding to the distal opening of the administration lumen. The optical system includes an optical element and an end dispersion element. The optical element is positioned within the optical lumen and the first end of the optical element is attachable to a fiber optic line. The end dispersion element is positioned at the second end of the optical element and is structurally configured to disperse light transmitted through the optical element.