James Colgain, 779th Medical Group optometrist, reviews 811th Security Forces Squadron response force member, Airman 1st Class J.D. Whelihan’s orbscan and wavescan results, at Joint Base Andrews, Md. Dr. Colgain will use this information and other measurements to determine if the patient is a candidate for refractive surgery. (U.S. Air Force photo/Staff Sgt. Perry Aston)