John, to make a long story short, glasses have no effect on seeing through any eye piece, or scope for that matter.
I always thought that i needed to focus my scope and camera with them on, because i figured that if i focused with them off my focus would be out because the camera didn't know i was half blind. However this was not the case. it makes absolutely no difference at all.
If I focus with the glasses on of or off the focus is still perfect, however I do have to wear them to see the stars clearly, just as a visual.
This may not be the answer you are seeking but that was my experience.
Leon
