Having eyesight in only one eye is enough for photoreading. Naturally you will never see the blip page which is okay since there are a number of other cues that you have obtained the correct focus (like noticing the white of the page and the patterns it makes)
You can check if your instructor is certified on the LSC site. Point your browser to the Seminar pages (left hand column)
Here's a direct link for convienience. http://www.learningstrategies.com/PhotoReading/Seminar3.html
After the seminar you can take in as many textbooks/books a day as you want. Activation becomes easier the more you use the system. You don't practice PhotoReading - you use it as often as you can. Apply it to all your reading material on a daily basis and it gets better till you hit your own personal comfort zone.