@dlowan,
Do you know how terrible, diopters-wise?
I'm just trying to prepare myself for the possibility that the march will continue for a while -- if I'm convinced that -10 diopters (for example) isn't a big deal then I won't worry as much. (OK I'm the tiniest bit freaked.)
She has taken beautifully to contacts. Usually she just wears them for sports. She likes glasses fine, though we were already shopping for new frames before I realized that her eyesight had gotten much worse. I did plan on having her eyes tested before getting the new glasses.
That's actually another branch of inquiry, how long people who wear contacts have been wearing them and whether there were any ill effects. She's a pro at getting them in and out, better than me. (I wear contacts only very occasionally.)
The eye doc said that there is some study going on at OSU now, she emphasized that sample sizes are too small to draw any firm conclusions but FYI; three groups of kids, one with glasses, one with soft contacts, and one with hard contacts. The kids in the soft contact group had the least vision deterioration. (Her contacts are soft ones, Acuvue Oasys, lovely things, first kind of contacts I can wear with pretty much zero discomfort.) (I have the same kind.)
Overall though it looks like there's just not really anything that can be done, prevention-wise. Reading with adequate light and not too close up seems to maybe help a bit.