Dr. Robin Collard, McDonald Army Health Center Eye Clinic optometrist, uses a 20 diopter lens during U.S. Army Col. Glenn Hodges’, U.S. Army Training and Doctrine Command Army Capabilities Integration Center human performance and learning analyst, annual eye exam at Fort Eustis, Va. Aug. 21, 2015. She used the lens to examine the patient’s surrounding retina for abnormalities after having his eye’s dilated and checked for glaucoma. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)