A black light illuminates U.S. Navy Petty Officer 1st Class Alfonso Camacho's eyes after he received fluorescein drops during an exam in the medical department aboard the USS Carl Vinson under way in the Pacific Ocean, Dec. 17, 2011. Camacho is a hospital corpsman. Fluorescein is used to detect problems on an eye's cornea. A black light illuminates U.S. Navy Petty Officer 1st Class Alfonso Camacho's eyes after he received fluorescein drops during an exam in the medical department aboard the USS Carl Vinson under way in the Pacific Ocean, Dec. 17, 2011. Camacho is a hospital corpsman. Fluorescein is used to detect problems on an eye's cornea. SHARE: Download: Full Size (1.91 MB) Tags: Photo Essays Credit: VIRIN: 175370-L-OVL44-477.jpg Photo Gallery