Pope Francis touches the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis touches the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (L'Osservatore Romano/pool photo via AP)
Pope Francis exchanges a gift with 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Pope Francis blessed the eyes of the 5-year-old Ohio girl who suffers from a rare genetic disease that is gradually robbing her of her sight. (AP Photo/Andrew Medichini)
Pope Francis speaks to 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
5-year-old Lizzy Myers, bottom, poses with her parents, Steve and Christine Myers, and her sister Kayla, in front of St. Peter's Basilica at the Vatican, ahead of Pope Francis' general audience, Wednesday, April 6, 2016. The family, from Bellville, Ohio, are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis meets 5-year-old Lizzy Myers, from Bellville, Ohio, and her mother Christine at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis touches the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (Alessandro Di Meo/ANSA via AP)
5-year-old Lizzy Myers, bottom, poses with her parents, Steve and Christine Myers, and her sister Kayla, in front of St. Peter's Basilica at the Vatican, ahead of Pope Francis' general audience, Wednesday, April 6, 2016. The family, from Bellville, Ohio, are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis touches the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis touches the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis touches the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis speaks with 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
5-year-old Lizzy Myers, bottom, poses with her parents, Steve and Christine Myers, and her sister Kayla, in front of St. Peter's Basilica at the Vatican, ahead of Pope Francis' general audience, Wednesday, April 6, 2016. The family, from Bellville, Ohio, are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis caresses the face of 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)
Pope Francis speaks to 5-year-old Lizzy Myers, from Bellville, Ohio, at the end of his general audience in St. Peter's Square at the Vatican, Wednesday, April 6, 2016. Lizzy and her family are on a week-long visit to Rome which included a tour of the ancient Colosseum and the hope for a glimpse of Pope Francis. (AP Photo/Andrew Medichini)