Wandering to the TV

• "I think we're going to have to put a seatbelt on you to strap you to the couch because you're eyes are going to melt out of your face if you keep standing so close to the TV."

When I first began working with the family, I noticed that whenever I'd sit to watch TV with the 7 year old, he would wander out of the couch and stand right infront of the TV blocking my view. Being as I wear glasses and as a child I was always told that it was because I watched too much TV, I took advantage of all the ridiculous things my parents and other adults would tell me when it came to behaving as a child. Though this has yet to be solved, the 7 year old will randomly get up while watching a tv show and stand directly infront of the TV, about 2 feet away from the screen. I have told him so many times that he needs to back away from the TV and sit down. At first, I would tell him that his eyes would get messed up if he didn't do this. Since this didn't work, I started telling him that his brain would fry and that he would no longer be able to enjoy watching TV if he kept on standing so close to it. This also did not work. I later began telling him that if he didn't back away, his eyes would start to melt out of his face and he would never be able to see again. This probably worked for a solid week, then he started ignoring me whenever I'd say it.
Recently, I have used my own eyes as an example as to why he should not stand infront of the TV while trying to watch it. About a month ago, I went to the eye doctor and got my new prescription for my glasses and finally got confirmation that I am in fact legally blind (20/400 Vision). Just last week, I picked up my new glasses and because they were a different prescription from my old ones, I've been wearing them daily for my eyes to adjust to the new prescription. The day I picked them up, I had to work and when I got to the house, the 7 year old saw my glasses and I instantly showed him how thick they were; lenses that are 1 cm thick. He started laughing because he had always thought I was joking when I told him how bad my eyes were and he still didn't believe me, so I proved it to him. I put my glasses on him and he instantly realized I wasn't lying. He was completely shocked and as he took them off, I told him, "This is what happens if you don't listen to people telling you to back away from the TV. You're eyes will slowly start getting worse and worse, and then before you know it, you can't see a single thing unless it's a foot away from your face. Do you enjoy waking up in the morning and being able to see everything without having to find your glasses before knowing what time it is? [He shook his head and walked over to the couch.] Good choice." So far, this technique has worked well, but then again, I've only used it last week and this week, and it's only Tuesday.