Optical fibers have transformed communication, they are also revolutionizing medicine. These ultra-thin, flexible fibers have opened a window into the living tissues of the body by inserting optical fibers through natural openings. Physicians can look into the lungs. Intestines, heart and other areas that was formerly inaccessible to them. The doctor will use this tool into the body of the patient, because small bring light fibers can conform to the body, similar to using a large needle into it to make it not affect tissues or other internal organs that are not relevant. In addition, the fiber light technology has also been applied to treat the disease. Fiber-optics system is called the fiberscope, which consists of two bundles of fibers. One, the illuminating bundle, carries light to the tissues. It is coupled to a high-intensity light source light enters the cores of the high-purity silicon glass and travels along the fibers and Optical fibers can also be used to deliver laser light, By use of laser beams.