Transcript for Baby Boy Experiences Magical Moment When Glasses Are Placed on His Face
Finally tonight, a magical moment for one baby boy whose life suddenly changed when a pair of eyeglasses was placed on his little face. Before that, everything was fuzzy. But now, those bright eyes are taking on a whole new world. John donvan with the story tonight. Reporter: Okay, we're just gonna show it to you. So, watch this. Watch the expression on this baby's face. His name is Leo, he's four months, and this smile, here's why it means so much to his mom and dad. Before that moment, Leo, who has a rare disorder affecting his vision, had never had a good clear look at the world. Most of what he's been able to see up until getting the glasses was extremely fuzzy or completely out of focus. Reporter: Yup, everything, even up-close things like his dad's beard. He'd look at him or get close to his face and instantly put his hands towards his cheeks, maybe to identify if it's dad or if it's mom. Reporter: So the glasses were there to fix that. And the video, it shows the moment he first puts them on and first looked straight into his mother's face. And there's that hesitation. And then, there it is. Leo obviously likes what he sees. That smile was something that was so different. It was just remarkable. Reporter: Yes, it was remarkable. So here's one last look, at this first look. John donvan, ABC news, Washington. Tonight, all of us are smiling with Leo. "Gma" first thing in the morning, David Muir will be back tomorrow night. I'm Tom llamas in New York, have a great evening. Thank you for watching.
This transcript has been automatically generated and may not be 100% accurate.