If you're actually writing for children, especially young children, then I guess you don't want to scare them off - but if you're writing for adolescents or adults you can afford to be honest.
So here's the thing. Every book or story in which a character gets glasses for the first time - or the second if their first pair is painfully out of date - emphasizes how clear everything is and how they can see so much detail that they had no idea they were missing. And yes, that's a thing. None of them point out that it's a thing that can be less "wondrous" and more "disorienting and distracting" until you've gotten used to seeing that much detail.
None of them mention that if your prescription is strong enough - especially if there's astigmatism involved - your perception will be wonky and you'll have a hard time judging how close and far things are for a day or two.
Definitely none of them mention that you will
absolutely get eye strain every time you get a new prescription, and possibly headaches or nausea to accompany it. It goes away, again, in a day or two, but until it does you'll feel like you're cross-eyed at all times. (And with children, every year is a new prescription. They grow, which means their eyeballs grow, and just like that growth is unlikely to suddenly give them perfect vision if they already were nearsighted, it's also unlikely to keep them exactly where they were before.)
Absolutely none of them point out that if you've never worn glasses before you'll have to spend the aforementioned day or two learning how to not see the frames. This is also true if your old frames were much bigger than the new ones, but that, at least, is less likely to apply to children - their faces grow along with the rest of them, necessitating larger frames, so even if they choose a smaller overall style with the new pair the fact that it fits properly may even out.
Moving past the realm of accurate fiction writing, children really should have their first optometrist appointment, at the latest, in the summer before first grade (so, aged 5 or 6 years old). Ideally, they'll have it before they start school, at age 2 or 3, but you can't convince people on that point. They should have a new appointment every year until the age of 20 or so, or every two years if every year really is unfeasible,
even if you don't think you see the signs of poor vision. They won't complain that they can't see, because they'll just assume that their vision is normal. This is true even if they wear glasses - you never notice how bad your eyes have gotten until you get a new prescription, and then it's like "whoa".
The screening done at school or at the doctor's office is imperfect at best. You really want the optometrist.
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