The problem in France is finding an “eye doctor” - especially in the boonies.
If you live in a large-town it is far easier. Last time I asked for a prescription out in the boonies where I live, it took a month and a half of waiting-time to finally get it done.
Moreover, after a certain age, your eyes don’t change much. The old prescription, if it works for you, is good enough. I have even sent a pair of glasses over the internet - instead of seeing a doctor for a new prescription - and the new pair work just fine (like the previous pair).
Of course, that might not have the same result for everyone …