often enough prescriptions for lenses are not filled out correctly.
If it were me? I'd take them to an independent optician/optomotrist and have the lenses checked against your prescription.
I NEVER get a prescription filled out any more that I don't have a copy of! I've found too many errors in tests, prescriptions and bloodwork that wasn't done correctly to not do so!
Get those lenses checked, please! Errors can cause all sorts of peculiar problems... - j

PS good thing that they are double checking Alan's back, best to be safer than sorrier.