U.S. Air Force Capt. (Dr.) William Catt, 99th Aerospace Medicine chief of aerospace optometry, dials in a phoroptor at the Optometry Clinic in the Michael O’Callaghan Federal Medical Center June 7, 2013, at Nellis Air Force Base, Nev. The phoroptor is commonly used by eye care professionals during eye examinations to determine their eyeglass prescription. (U.S. Air Force photo by Senior Airman Daniel Hughes)
CAMERA
N/A
LENS
APERTURE
SHUTTERSPEED
ISO
No camera details available.
This photograph is considered public domain and has been cleared for release. If you would like to republish please give the photographer appropriate credit. Further, any commercial or non-commercial use of this photograph or any other DoD image must be made in compliance with guidance found at https://www.dimoc.mil/resources/limitations, which pertains to intellectual property restrictions (e.g., copyright and trademark, including the use of official emblems, insignia, names and slogans), warnings regarding use of images of identifiable personnel, appearance of endorsement, and related matters.