Yay, vision does make life easier. And yes on the spare pair, though it still doens't always help - when I lived in Germany for a year, I carefully took my spare pair of glasses with me, but that didn't help much when they were safely in my flat and I'd just managed to snap the plastic frames of mine while cleaning them sitting on a tram into the centre of Hannover, some three hours train ride from said flat! There was much wandering in and out of late-opening shops hoping for sellotape (interesting problem when neither me or my friend knew the word for sellotape), and then the problem of getting an eye test and replacement glasses when I finally got back to my town.