There are 39 million people worldwide who are in total blindness and another 246 million with very low vision. The most frequent forms of visual impairment are caused by problems that can be corrected. Dr. Shira Johnson welcomes Dr. Jean Bennett, Professor of Ophthalmology and Cell and Developmental Biology at the University of Pennsylvania and researcher at the Children’s Hospital of Philadelphia. Dr. Bennett discusses her innovative work and research in curing blindness through gene therapy.