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Dr. Allan Rhoads, 92nd Medical Group optometrist, uses a phropter to check a patient's vision with different lenses to determine his eyeglass prescription at Fairchild Air Force Base, Wash., April 11, 2013. Retirees and their dependents are authorized one routine eye exam to include refraction for glasses every two years. (U.S. Air Force photo by Airman 1st Class Janelle Patiño)
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