my ridiculously active 3 year old also wears glasses. i go to a high end optometrist for myself because of their amazing service, but when i found out tyler needed them, there was no way i was gonna pay that much for glasses that i knew he would break. i shopped around eeeeeeverywhere that i thought would be cheaper, and they were. those flexible glasses were sooooo much cheaper. i talked to my guy to see if he could compete, he doesnt even deal in those glasses for the exact reason you are talking about. he said they end up completely misshapen and dont align anymore, so its useless for vision correction and uncomfortable for the kids, so they just take them off. i ended up paying more than i would like to admit for a pair of glasses from izod. the hinges flex out and the nose piece is pretty flexible. im still back there every week or 3 to get them fixed/adjusted, tyler has flattened them so many times, omg its so frustrating. but when they adjust them, they are perfect again. and when he wears them, he can see! we tried on lots of those flex ones and they just didnt sit right on his face, and i know he would constantly take them off, especially if they didnt align. tyler has a bad astigmatism, which, as i understand, really needs the glasses to be centered just right. and i know thats why he mostly leaves them on, because they help him. if they didnt, he would take them off right away. but the good fit and vision correction makes him forget they are even there, usually till around dinnertime. thank goodness. i need a lojack on them! they are so little and very plain grey, they are invisible! if i had to do it over, i might get a color or something, just so i can find them when he leaves them in the yard someplace. but i am so happy i went for the good frames. and go to a place that has insurance, mine will fix them for free as often as i need, and will replace them at, i think, half price. good luck.