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You can order new glasses - sunglasses or otherwise - from numerous sites online without needing to concern yourself with the date on a prescription. Assuming the prescription in question still works for your eyes of course.

That's wild. This is the first I've heard about mandatory eye exams and I've worn glasses all my life.

I've picked up frames and new lenses, both online and in local stores, without having anyone point out that my prescription was at least a decade out of date.

The frames that I generally go for are pretty pricey anyway, and maybe that's a factor, but I've never been prohibited from buying an new pair. I've also had older lenses re-cut to fit newer frames, all without issue.

Yep had this problem except it was only for 6 months. Trying to get glasses for the first time, had an eye exam in April, and last week Costco would not fill my prescription

Which makes zero sense. Whether you buy a new pair or not, you would still be wearing an out of date prescription.