I have VSP insurance, and I am not knocking them, I am thankful for any insurance help. I am also aware that my prescription is also a lot stronger than most. But like many of us, we just can't afford to lose our glasses on vacation, or any other day.
I always carry an extra pair with me just in case I lose my original on vacation. That fear of losing my glasses, or breaking them is always with me. It has happened so many times.
Paying these extraordinary prices for glasses has led me to search for better and less expensive ways to fill my eye-glass prescriptions. You just need to make sure to get your prescription from your doctor (you may need to ask for it), and put in the information online. While you may still want to buy your glasses at the store, you may want to pay for the least expensive pair and see what you can find online. You will usually end up paying substantially less than what you would pay with insurance.
Just make sure to do as much research as possible. Depending on your insurance, your choice of eye-glasses, and your prescription, you may still get a better deal from your local vision specialists.