FILE – In this Oct. 4, 2017, file photo, Dr. Albert Maguire, right, checks the eyes of Misa Kaabali, 8, at the Children’s Hospital of Philadelphia. Misa was 4-years-old when he received his gene therapy treatment. On Tuesday, Dec. 19, 2017, the Food and Drug Administration approved the therapy which improves the vision of patients with a rare form of inherited blindness, another major advance for the burgeoning field of genetic medicine. (AP Photo/Bill West, File)