Tallman,
Not being able to see the 3d images is a minor problem associated with Dyslexia... you probably can see them but it not a major issue if you can't. It's kind of like being colour blind.. you learn to compensate for it.
If you printed them out look at them in natural light or incandecant lighting. Avoid working under fluro lighting conditions. Dyslexics are more sensitive to the flickering of fluro lights and it can cause them to experience headaches when reading/working under a fluro light for long periods. (23 years of reseach)
It took me ages to see those darn things too 
even though I have excellent peripheral vison... (They haven't figured out how come they cant sneak up behind me to make me jump since I can't even hear a thunderclap ).
If you don't see them, let it go, stay relaxed do it for fun. The thing is just as they start coming into focus they start moving, when happens you have to keep looking through it... Say to yourself "look past" it, it suddenly stops but you're not looking at the picture you are looking through it.
Being dyslexic you've probably been training yourself to maintain focus.. not to let the image (letters) move, the moment that starts to happen you pull your eyes back into focus. Whether you are aware of this or not I don't know. My research has found that nearly all dyslexics complained that the letters seemed to move when they were trying to read.
AlexK
but I will still keep trying 
