Looks like a lot of subjects have been hit on already.

I was going to agree with draw length but you said you adjusted it this year.

Frames are getting smaller but I don't think that is it. It sounds like you are looking in between the two lenses and most perscription frames use two lenses so a larger lens won't help.

I'm guessing that your head is not positioned correctly. I target shoot with my glasses on and don't have a problem. My head is postitioned about 45 degrees in relation to the target. If your head it turned too far away from it, you would be looking across yor nose more. Try changing your head position.

The other question is "What changed?" I'm guessing this isn't your first year shooting a bow so how did you do it before?