I believe that it may be possible for you to get a pair of replacement glasses made quickly in Pamplona. I cannot give any more information than this, as I read it in one of the many books on the camino which I read before reading last year. A pilgrim was resting and left his glasses behind when he moved to avoid a large grass cutter, which ran over his glasses. He got his eyes tested and his glasses replaced very rapidly in Pamplona. As I remember it, he said that it was a blessing, as his new glasses had an updated prescription which gave him a much clearer view of the camino. However, it stands to reason that a city the size of Pamplona would have facilities for making eyeglasses. Good luck in getting your glasses back or replaced. If your vision is as bad as mine, you might not be able to proceed without them.