Snakes and stones never broke my bones, but shots to the eye could really hurt me! Which is exactly why ophthalmologist, Peter Campochiaro is looking to gene therapies to stop vision loss. Some therapies for vision-threatening diseases require that patients get a drug injection to the eye as frequently as every 4 weeks. Ouch! By replacing disease-causing genes in the eye, he hopes to develop new, more permanent treatments for macular degeneration. He uses images like this one of a rat retina to see if the therapies are working by following the glowing green cells.