The prism turns the page to a 90 degree angle right before your eyes, eliminating the need for head movement. Lie on your back with your head upon the pillow as normal, and you'll be able to read the book which rests comfortably on your chest.
Advice & Tips:
I just got mr 3rd pair of lenses since 11-2010 to address my double vision. My 1st pair was simply a stronger prescription, mainly in my right eye which was significantly weaker. One month later, I was still having double vision, so I had another set of lenses - with horozontal prism. Less than 1 month later, I was still having double vision (however, the images were closer together than before. on 2-1-2010 I now have 2 prism's in each eye (Vertical and horizontal). Thus far, after 1 day, they are working better than the 1st pair of prism's.
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