Baby glasses?

Gu

So my 2.5 year old just got glasses yesterday and I have a few questions for mamas who had kiddos with glasses from a young age.

Any tips on getting him to leave them on? He will leave them on for awhile but then takes them off and doesn’t want them back on.

How do you know that they are the right prescription? They used this machine to check his vision

How accurate is it? The machine said that he is very near sighted which is what I had been thinking (he was getting so close to everything trying to see it and he was tripping over everything) I guess I just assumed when he got the glasses he would want to leave them on since they would make him see better but since he doesn’t want to leave them on long I’m questioning if it’s not the right prescription?

How long did it take for them to get used to glasses?