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This thread is really long, so sorry if I missed it, but as someone who does not currently know what their expired prescription was. Is there some way to tell or measure what prescription the glasses I am currently wearing are? My eyesight hasn't changed at all and I need another pair, but I don't know my prescription.

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https://www.glassesusa.com/scan can supposedly tell you using your cell phone and computer.

I've been to opticians in the UK where they have a machine that will do that.

I remember once i'd bought cheap glasses online, then a year or so later went for an eye test; my prescription hadn't changed, but they measured the glasses, and found that they weren't quite right for the prescription, so i got a new pair. An effective sales technique, and assuming that they weren't lying to me, a useful service for me.

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