try doing one of those 3-d puzzles, photofocus on it and then return to normal, practice getting back out of focus when you're done. also, try the warm cloth thing to heal your eyes and relax the focus and convergence/divergence muscles, which probably are causing the problem. the muscle is probably stuck or tired. if none of that works, you can just notice all 4 corners of the book, connect an x, and notice the white space. dont completely unfocus if you can help it. paul says in the personal learning course: "Eventually, the muscles for converging and diverging develope seperately from those that focus." and for photofocus, you only need to diverge your eyes(widening your gaze), not necessarily lose focus completely.
