Contact lenses or glasses for the Camino de Santiago?
Glasses are more practical on the Camino, but you can also easily use your contact lenses on your way, only you should be concerned about the "flying dust" which is very painful when it gets into your eye or scrubs your eyes and the lenses. Wear soft contacts lenses that you can replace monthly, but take them out at night. Have a few extra pairs just in case. Don't miss the travel size lens solution too. Weight and space is minimal.
Nothing unnecessary just exactly what you need for your Camino