U.S. Navy optometrist Lt. Cmdr. Randy Birt (left) uses an ophthalmoscope to check the retina of a Tongan woman at a medical site in Tuanekivale, Tonga, during Pacific Partnership on April 16, 2011. Pacific Partnership is an annual deployment of forces designed to strengthen maritime and humanitarian partnerships during disaster relief operations, while providing humanitarian, medical, dental and engineering assistance to nations of the Pacific.