looking through a phoropter

U.S. Air Force Master Sgt. Gennifer Sauter, a debts remissions branch chief with the Air Force Financial Service Center, looks through a phoropter during her pre-retirement eye exam at Ellsworth Air Force Base, S.D., April 7, 2010. (DoD photo by Airman 1st Class Joshua J. Seybert, U.S. Air Force/Released)