Patients sit with their eyes bandaged at an Aravind Eye Care clinic in Madurai, India after cataract surgeries. Aravind performs more than 300,000 cataract surgeries annually. Reinhard Krause/Reuters/Landov hide caption

itoggle caption Reinhard Krause/Reuters/Landov

Sound World Solution's hearing device lets a user customize its settings using a Bluetooth connection and a smartphone. Courtesy of Sound World Solutions hide caption

itoggle caption Courtesy of Sound World Solutions

How many calories in that bite? My Fitness Pal and other fitness and nutrition apps can help find the answer. Heather Rousseau/NPR hide caption

itoggle caption Heather Rousseau/NPR

A construction worker paints walls at the Maryland Proton Treatment Center in Baltimore. Each of the center's five rooms will contain a massive piece of equipment that will rotate around a cancer patient to deliver a special kind of radiation. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

Kaiba Gionfriddo, who breathes with help from a splint created by a 3-D printer, plays with his family dog, Bandit, at his Youngstown, Ohio, home. Mark Stahl/AP hide caption

itoggle caption Mark Stahl/AP

An angiogram of a 48-year- old patient after treatment for a stroke. A blockage was targeted with clot-busting drugs using a catheter. Zephyr/Science Source hide caption

itoggle caption Zephyr/Science Source

Lt. Cmdr. Stephen Mannino checks a sailor for skin cancer the old-fashioned way during a screening exam at Naval Amphibious Base Coronado in San Diego. MC2 Dominique M. Lasco/U.S. Navy hide caption

itoggle caption MC2 Dominique M. Lasco/U.S. Navy