In microsurgery, the surgeon operates while viewing the procedure through a microscope or magnifying glass. This technique enables physicians to perform operations on some of the tiniest body structures. For example, surgeons can rejoin extremely small blood vessels and nerves by using this technique. Such surgery has led to the successful reattachment of severed fingers, hands, and even arms and legs. Doctors also use microsurgery to operate on the delicate structures in the eye, the kidney, the brain, and many other parts of the body.