Team USA para swimmer Anastasia Tas Pagonis lost all her usable vision at 14 due to a genetic and autoimmune retinopathy. "Swimming is my happy... place. Swimming is a place where I feel free," she tells us. The 17-year-old has over two million followers on social media and is a role model for many girls. "The messages that I love the most is people saying: You really changed my life." Here's her story.