I used to have that problem too, I was -5.25 or so. The problem was I kept getting upsold on high index lenses. Yes, they are thinner, but the distortion at such a high correction was horrible. Small frames help, but then you have no peripheral vision. I switched to CR-39 and it was so much better. It's also the cheapest possible option which is nice. If you ask for the edges to be polished clear the thickness is less noticeable to others.

I eventually got sick of the coke bottles and got Lasik. I can see better than I ever thought possible, but the recovery was brutal. It was more than two years before I could go a day without Systane Ultra.