Optical fibers have revolutionized medicine. The ultra-thin, flexible fibers have opened a window into the living tissues of the body by inserting through natural opening or small incision. The basic fiber-optics system or fiberscope consists of two bundles of fibers. The first, the illuminating bundle carries high-intensity light. The second, the imaging bundle collect a tiny fraction of a total image and the reconstructed image can be viewed through an eyepiece or displayed on a television screen. Optical fibers can deliver laser light by Physicians can perform surgery inside the body. Many of these procedures do not require anesthesia and can be performed in a physician's office.