The Luxottica "warranty" is less than worthless as far as I can tell.
I bought a $200 pair of Ray-Bans. I was careful with them the whole two months I owned them. But the arm broke off one time when I (gently) picked them up. I tried to have the broken piece replaced through the warranty process, but to no avail. After several calls and emails to Luxottica, and them giving me the run-around every time, I gave up. That seems to be their business model, so I suppose they win.
Now I avoid buying sunglasses that have a Luxottica warranty on principle. It's my tiny revenge.