$US Navy 101019-N-1531D-054 Air Force Master Sgt. Breck Downey uses a auto-refractive keratometer to determine an eye prescription during a Continui$

US Navy 101019-N-1531D-054 Air Force Master Sgt. Breck Downey uses a auto-refractive keratometer to determine an eye prescription during a Continui

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Author: U.S. Navy photo by Mass Communication Specialist 2nd Class Jonathen E. DavisSource: commons.wikimedia.org

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