The cornea is the outermost lens of the eye and serves as the window through which light enters the eye. When the cornea becomes cloudy, opaque, or painful as a result of injury or disease, cornea transplant surgery becomes necessary. The operation usually takes an hour and a half and is the most common of all transplant surgeries. Sixty-nine-year-old Margaret Hurr has a failing cornea in her right eye. But unlike so many patients ophthalmologist Dr. Linda Burk sees, Margaret also has a failing intraocular lens, located just behind the iris. Both lenses will be repaired through microscopic surgery using human tissue obtained from a recently deceased donor. A Discovery Channel Production. (45 minutes)