James Colgain, 779th Medical Group optometrist, uses a VK Digital slit lamp camera to take a picture of the patient's cornea at Joint Base Andrews, Md. The binocular slit-lamp examination provides a stereoscopic magnified view of the eye structures in detail, enabling anatomical diagnoses to be made for a variety of eye conditions.(U.S. Air Force photo/Staff Sgt. Perry Aston)