I usually remove my glasses when I do the PhotoReading stage. If I consider the book important, I'll turn it upside-down, too.
It's not so much that blurry helps, so much as non-blurry might confuse the conscious mind into doing things that we don't want it to do. As those who post ads inside of bathroom stalls know, it is very hard to tell the conscious not to read something set before it.
