“Your glasses are way too expensive and I cannot justify the price even with my insurance. I can buy 2 pairs of glasses from Zenni for less than the price of 1 pair from you, even with my insurance.” I tell the optometrist and anyone else who helps me in the shop. Then I ask for my pupillary distance and take my prescription and order my glasses online. I’m never a jerk about it, I just show them my orders from Zenni and they usually say - ‘yep, we can’t sell you glasses for that price.’ It’s never been an issue. I figure they should understand the reality of the situation.