My daughter is also the same age and has had glasses since she was about 18 months. Defo before she was 2. She wears them all the time, not going to lie it was hard work, be it it can be done. We were told she needed to wear them, kids over correct their vision? So they don't realise they need them ( or something like that) that's why it's important they wear them, eventually they get used to them and realise they need them, and ideally it should be done before school... daisy's glasses look quite thick so I recon she defo needs them, Charlotte had meltdown over the fact daisy needed glasses. I think that has something to do with it.