Any Trivex lenses being molded in the USA?

I'm curious as to where molded Trivex lenses (stock single vision, semi-finished flat-tops, others?) are being made, and if none in the USA, why not?

I'd like to explore the fabrication methods being used, so any pointers there would also be helpful.

Also, I've always wondered how they manufacture a front surface mold for a flat top, and even an exec for that matter.

Any Trivex lenses being molded in the USA?