E.M.
Ok, I have NO advice except this: get the insurance!! My daughter got glasses a few months after turning two. Strong-willed is the understatement of the year to describe this child. :) We went through the one-time replacement warranty with both the frames and the lenses in the first six weeks. We then had to buy another pair and pay full price. After those were trashed (and super glued over and over) we finally switched to Target and got the insurance so that replacement pairs are like $25. PHEW. It has been about a year and a half now and we have had 5 different frames I think. She takes them off a lot, leaves them around, throws them on the floor when she's mad etc. Sometimes we can't find them for a whole day. It's been interesting to say the least.
Good luck! :)