Hi,
Your readers who need glasses may want to consider learning how to order glasses at www.zennioptical.com. I first learned of them from an article in The Wall Street Journal a number of years ago. They are reputable, and the waiting period to receive your glasses is about the same as that at retail stores. I typically obtain glasses for about one-third of the cost at retail eye glass stores, and at that price you can afford the spares you want. – A.K.