My recommendation is Zazen Meditation as it most closely fits the mental processing in PhotoReading. It improves your concentration and activation skills.
The meditation is done with the eyes half open and are never closed. For more info see http://www.mro.org/zmm/zazen.shtml
"When you've been practicing this process for a while, your awareness will sharpen. You'll begin to notice things that were always there but escaped your attention. Because of the preoccupation with the internal dialogue, you were too full to be able to see what was happening around you. The process of zazen begins to open that up."
Zazen is the foundation of the martial arts, of being able to perceive everywhere and nowhere, to take in the entire visual field and expand your peripheral vision, a kind of focused awareness, and to act without the interference of thought. It's very akin to having the orange behind the head and looking through the book to a point beyond the book.

[This message has been edited by shr33m (edited August 02, 2003).]