I'll take that a step further- I've noticed that folks who don't wear a distance correction see an eye doctor much less frequently than those who wear eyeglasses full-time, mostly those with VAs of 20/40 or better. I think it's likely that this group has a much higher percentage of undiagnosed pathology and subsequent preventable vision loss.
WRT expiration dates, I believe a big part of that is to protect the prescriber from unnecessary and unreimbursed chair time. I believe it's the optician's responsibility, based on ocular health and history, to advise the client whether it's reasonable to fill an Rx, or defer to a future exam.
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