Okay you've explained the reason you're getting headaches very clearly... narrowing of the eyes is squinting. You're still trying to see with your primary focus and are almost as good as crossing your eyes only worse. Squinting will bring on a headache very quickly because you are tensing the muscles of your face.
Let me make a couple of things very clear.
• You do NOT need to see the blip page to be in photofocus. In fact you can be seeing the blip page and NOT be in photofocus. Squinting and crossing your eyes are the way to do it.
• The page MAY be blurred and probably is when you look at it with a soft GAZE
• Both X-Technique and blip page are obtained with a relaxed soft focus.
For correct photofocus.
• Look at an object about 18 to 24 inches away from you (45 - 60 cm)
• Maintain your focus on that and slowly move the book into your line of vision. It will be about 12 to 18 inches (30 to 45 Cm) in front of your face.
• Still maintaining your relaxed normal focus on the distant object you selected notice the four corners of the book. Notice that on your book your gaze is soft and relaxed because your primary focus is on the book.
• The text is probably slightly out of focused making it blurry. That's natural because you are looking beyond the pages of the book. You're looking at the book with your relaxed naturally divergent gaze.
If you can comfortably see the four corners of the book proceed with the next step. If not adjust yourself slightly so you can see the four corners and maintain your focus on a distant object. Make it comfortable so you can turn the pages while you're doing it. The object can be 4 inches (10cm) behind the book or a lighthouse on an island well away from the shore.
• Notice the whites of the page and the imaginary X-technique. You may or may not see the blip page. No matter ... as long as your focus is on the object beyond the book and you can gently keep it on the object beyond the book begin PhotoReading, you are in photofocus.
In time you won't need to look at the object in the distance. You'll be able to move your gaze to the centre of the book and maintain photofocus. You may or may not see the blip page. The text is probably slightly blurred (you don't even have to force it) As you relax into photofocus over time the text will take on an unusual clarity. It's not important.
If you simply focus on something beyond the book and relax your gaze you won't have any problem.
Alex