Dr. Peter Campochiaro, a clinician-scientist and the Eccles Professor of Ophthalmology and Neuroscience at the Johns Hopkins University School of Medicine, talks to host Ben Shaberman about N-acetylcysteine (NAC), a drug that shows promise for preserving cone vision (central vision and acuity) in people with retinitis pigmentosa. The powerful antioxidant has moved into a 30+ site, Phase 3 clinical trial called NAC Attack.