Varminter.
There is nothing new in optical mathematics. Light refraction can be manipulated, but you trade one benefit for a non benefit. The only thing new in optics is the lens coatings, not really new but much much better as before.
Also good coatings are very expensive. Only the very best scopes have all the lenses coated. The cheap ones only coat the ones you can see. Lens grinding by machine is state of the art, but a hand ground lens by an expert will still beat it. Putting lens elements together by rude machinery is another story.
At present the best machine made lenses are made in Japan, the Germans subcontracted the lenses to the Japanese.
Today junk optics are sold for big profits to ignorant consumers.