Spurred by my scratched-cornea ordeal, I just ordered some prescription sunglasses online through a sunglasses website. I used a Wikipedia entry to understand my prescription card, a ruler to measure my pupillary distance according to instructions on another store’s website, Paypal to handle the transaction, and our office copier to make and email a scan of my Rx to the vendor. All very casual; I hardly noticed even doing any of this until it was all done.
How very Star Trek of you.