M.F.
Drive with your windows closed! LOL! My kids have worn glasses since before they were a year old, so I know just what you mean. Watch out for them sailing out the window. :)
The previous poster is right, though, the kids will wear them more than you think because they can really see better. In our house, when they would take them off, I would just very calmly put them back on. If my daughter protested, I would leave them off for a few minutes and then go over and calmly put them on again. We kept doing this (all very matter-of-fact) until she kept them on all the time. Now they both ask for them as soon as they wake up in the morning and are happier wearing them than not.
I definitely recommend the flexible frames. (Flexon in one brand, but I know there are others). Here's why . . . the flexible frames usually have a better warranty-- replacements for two years instead of just one. Check with your optician. They "give" a little if the kids fall on their face. It does bend them out of shape and you might have to have them adjusted a a little more often, but they actually do bend back as opposed to breaking (very important if your warranty doesn't replace the frames). My husband has gotten really good at adjusting them, so we do it at home. I find that the flexibility is worth the extra cost. The girls have had their current flexible glasses for over a year and we were able to reuse the frames and just replace the lenses (and they are still under warranty). Last time, we got them regular plastic frames and they were broken three times and the warranty only covered one replacement so we were holding them together with tape, screws, you name it, just to get through the rest of the year when she would need a new pair. I think it's because kids tend to overbend the glasses the wrong way when they are putting them on. If the frames don't flex, then the screws tend to get stripped and break. So the flexons cost more up front, but in the long run cost less, since the frames last longer.
Getting glasses for the little ones can be intimidating at first, but it soon becomes part of the regular routine and no big deal at all.
Good luck and great job getting vision care for your child at such a young age. It really makes a big difference.