Specifically, Joy was watching an episode of The Rachael Ray Show featuring a woman who also had Stargardt disease. She had been given technically advanced electronic glasses to help her condition. And, after putting them on, she was able to see much more clearly after five years of deteriorating vision.
Indeed, the woman was able to see her sisters within moments of looking through the special glasses. So, after thinking that there was nothing that they could do to help Gene, Joy was overwhelmed by the prospect that her husband might one day be able to see their son.