You may be having difficulty because there is an increase in the astigmatism and the material in the glasses has changed. This may cause a change in the base curve of the lens which may be responsible for the difficulty. I would recommend that you return to your doctor and explain your symptoms.
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California
I'm not an eye care professional but I do have a suggestion. Taking into account your astigmatism, there is a significant difference in refractive error between your eyes. This can produce an image size difference when wearing your new glasses--producing the nausea and motion sickness which you described. It is possible to minimize the image size difference by adjusting such factors as the curvature of the lenses, the center thickness, and the vertex distance. You might have to have the glasses remade by someone who knows how to make these adjustments. Good luck.
To add to what I said above, you already had a difference in refractive error between your eyes in your old glasses, but the difference has become greater in the new glasses. The increase probably pushed you over your comfort threshold. (Your left lens produces much more minification than your right lens.) I believe that changes in the lens curvature and the vertex distance could make your glasses more comfortable without changing the prescription.
Thanks so much for taking the time to give me some suggestions! I'll let you know how it goes when I take them back! I think they hide when they see me coming now, but, boy, have they been patient! :)
Tell your optometrist to consult the chapter on anisometropia. Mine says: "To effect a size equalization, increase the magnification for the more myopic eye." This can be accomplished by increasing the curvature of the lens or decreasing the vertex distance. Maybe your best bet would be to convince your optometrist to consult someone at his/her optometry school.
Beth, have you considered switching to contact lenses?
A related discussion, Hi Bethea was started.