Vision
Basically, what I have observed (sorry) about vision is anecdotal among people I know or have known, especially those who use computers. Something about the CRT and unnoticed flickering in it wreaks havoc with vision. Some principle with TV. Also, florescent lighting is hard on vision for the same principle. Unless you rest your eyes and take care of them, your vision deteriorates.
If you've learned about baseball, one of the greatest right-handed hitters of all time, Rogers Hornsby, refused to go to movies. He believed the flickering from the screen was bad for vision. It's understandable to see where he was coming from, given the flickering screens of the '20s.
Don't forget, Dr. Bates' research was done before before TV or computers, so it's almost an apples-and-oranges comparison. I read the book. Once again, the exercises are worth trying. They apparently worked for the old United captain who told me about the book. But, you apparently have to start with them early. As I said above, they really didn't help me because I was too far gone.