Puru13,
Yes, everything in your peripheral should be blurred.
Look at your computer screen and focus on the word green below for like 15 seconds. When you focus on it, notice everything around you....
GREEN
Now, see how you still notice everything around you? You can see your hands, even though you're not looking at them. If a little dark image went around the floor, you would probably look (like I always do) because it might be (which is sometimes is) a spider or something...
Don't you ever watch TV and then get distracted by something in the background? Well that's because you noticed it even though it was in your peripheral.
We naturally do this. The OP was only talking about it because he sees it as a way to make us better in certain aspects, which it can.
We naturally do this because if we are in the woods hunting for our dinner and we don't notice things in our peripheral, things that we're not looking at, then we would fall into holes, miss out on dinner, not see the enemy attacking us, etc. It's a completely natural thing, but some of us are better at it than others. The OP's point is to expound upon this natural ability to use it to help us better than it does already.
It's like everyone knows how to jump. But when you were a kid, you learned that if you ran and jumped right before a crack in the sidewalk or a little dirt pile, you could jump over it!
Same with this.
So, don't think your eye focus needs to be on the things as much as your awareness to them. My dog is sitting in the room where I'm typing right now. Without looking at him, I can tell he's laying down. When he picks his head up, I notice it. Sometimes, when I am really into a video game or a movie, I don't notice it when he moves his head because I am "blanking." But it's fine to blank in these situations because I'm in my apartment and I don't care if my dog moves his head.
But when I am out where I can possibly pick up a beautiful girl, I don't want to miss out on any girl. But if I never practice, how am I going to be good enough to work the OP's idea well enough for it to actually work?
So practice, but don't think you need to be reading words you're not looking at. Just be aware. Awareness is the key. If I am going to practice on my dog for the next hour, I want to be able to know my dog is coming over towards me well before he gets to me. My dog should never surprise me. I should notice when he moves, when he gets up, when he looks at me, etc. (If I am practicing on my dog). But I can still write posts like this, study, play video games, do work, etc. even though I'm focusing on him. It's not that I'm unaware of what I'm doing or that I'm straining my eyes or focus to look at my dog or anything else, I'm just more aware.