Staff Sgt. Aaron Prevost, 22nd Aerospace Medical Squadron optometry flight chief, relaxes in a chair while Maj. (Dr.) Gerardo Robles-Morales, 22nd AMDS optometry flight commander, uses a binocular indirect ophthalmoscope during an examination Jan. 31, 2018, at McConnell Air Force Base, Kansas. Robles-Morales used a small lens with the binocular indirect ophthalmoscope in order to enhance light and magnify his vision to see the retina through dilation of pupil. (U.S. Air Force photo by Airman 1st Class Alan Ricker)