I can see the need for YouTube videos on a smartphone. Lord knows, I’ve taken advantage of my wife’s iPhone during long trips in the car or endless waiting in a doctor’s office. But sunglasses with video capability? I can’t see where that would be an advantage. First, the screen is going to be right by your eye. I remember Mom telling me not to sit too close to the TV since it would wreak havoc on my vision. Video sunglasses would be the equivalent of pasting your face to the TV screen. Plus, how distracting would it be to try and walk down the street with these things on? You’d be lucky to make it 10 feet without tripping or bumping into something.