Glasses for kids

[Madgirl151]

Hi
I know the general rule for prepping and people who wear glasses is to have a spare pair (or 2 or 3) but what about for children whose prescription will change vastly. The reason im asking is because my 3 yr old daughter wears glasses and were it not for the new technology they would be the jam jars of old. If something happened and her eyes changed as she grew i would never be able to get her new ones as i dont know how they changed. is there anything i can do to prepare for that or do i just wing it and hope for the best???

thanks in advance

madgirl