Yes. Actually, varifocals DO take a while to get used to, and depending on what level of varifocal lens you chose when you got your glasses that might also have an effect. When your optician fit new glasses, they will measure your PD, or pupil distance so the center of the lens is positioned correctly in the frame to give you the best vision and avoid that dizziness. With varifocals and bifocals it is even more important to make sure this measurement is correct. If it is even slightly out this could cause, or at least exacerbate any other symptoms of vertigo that you experience, although these should stop when you take the glasses off if this is the cause.