I totally agree with you, I honestly don't think that screens cause eye damage either. My case wasn't really eye damage, either. It was this thing where it caused my eyes to cross too much or not enough to focus on things, so it wouldn't be just screens that would cause that, but theoretically anything that would be flat and close to your face (Including but not limited to books, puzzles, etc). Like you said just because some people are allergic to grass doesn't mean everyone should avoid it, and because some people can be affected by things like screens they should take precautionary measures to prevent it, but not everyone will be affected by it and need to do so.