The optics guy at Captains Nautical told me once that there's actually only about two companies left in Japan and maybe one in China that make optics, and they make just about everybody's binoculars. Dozens of brands but only a small number of actual plants.
I don't know who makes them in the U.S. anymore.
Suzi... the Swarovski glass outfit is the same company. yah... they make binoculars and telescopes too. Really, really spendy ones. I can say authoritatively that I'll never own them. :-)