Lt. Col. Steven Weekes, 4th Operational Medical Readiness Squadron optometrist, performs eye exam on Senior Airman Carlos Salgado, 335th Aircraft Maintenance Unit crew chief, using a slit lamp microscope, Jan. 21, 2020, at Seymour Johnson Air Force Base, N.C. The slit lamp microscope allowed Weekes to examine the different tissue layers in Salgado’s eyes. (U.S. Air Force photo by Airman First Class Kimberly Barrera)