Grimrapier, I can't really give you any specific advice to help you, but I'm sure there has to be a way to get the arrow under your eye. I struggled with this when I took up traditional archery; not because I wear glasses, I don't, but as a result of messed up teeth as a kid (and the method used to fix them), my canine teeth are position in such a way that they are more like fangs. A natural, relaxed position for me is out of the question. I have to use a radical nod to get my arrow under my eye. It took me a long time to hit on a form that was consistant for me. I'm sure you'll get there. If nothing else, you can always experiment.