I think that a big change in prescriptions can cause it temporarily as well, but definitely have them re-check the prescription/PD. A surprising number of mista

I think that a big change in prescriptions can cause it temporarily as well, but definitely have them re-check the prescription/PD. A surprising number of mistakes are made. Also if you notice that your eyes aren't centered vertically in the frames, that can mean the optical center is off which can lead to headaches.