Ted, I had a pair made through my Optometrist. For the type of frame that would 'seal', I chose bicycle racing glasses for the frames. They are made by Vizio, in Italy.
Another option is to use the type of frames worn by the military, which is what I originally had in mind when searching for curved safety glasses. Unfortunately, that style did not fit my smaller size face.
I wear bifocals, and getting a curved lens is a challenge for many optic labs. Places like LensCrafters, Pearl Vision and Walmart will tell you that you can't have a progressive curved lens. That's not exactly true - their lab can't make that lens, and they just want to sell you a pair of glasses. You need to go to an optometrist or ophthalmologist that can send your prescription to a lab that can make digital lenses.
Warning--they aren't cheap. But what is the price of your eye and your vision? Two year ago my px safety glasses (frames and lenses) cost about $400. If it means protecting my eyes, it's a bargain.