headaches from new eyewear

Until my cristal-based eyewear is fabricated, I was given temporary
glasses to wear. The lenses on these glasses are based on
antireflective coating, which my original glasses already had. This
temp eyewear is also based on the same, previous prescription.

The problem is, I'm getting headaches from this new pair. And when I
move my head to the side, I feel like I'm wearing funhouse glasses.

I've never had this problem before, especially when the new pair is
based on the exact same prescription.

Is there a problem with this pair? Should I tough it out and force
myself to get used to it?

 

Are they single-vision lenses? If so, then you probably have an aspherical
design. Also it is extremely important with an aspheric lens (or
progressive) that the optical center of lens be positioned in the frames
correctly relative to where your pupils are located. This requires a careful
fitting of the frame on your face, and proper cutting of the lens for
placement in the frame.

Other possible problems could be that your Rx is wrong, especially the
correction for astigmatism (cylinder and axis).