Eye doctors can become very annoying trying to convince you to start wearing contacts and glasses again, I know from experience. Eventually they sometimes get rude and start trying to scare or threaten you into it. Unfortunately mine is like this, and I just received a letter from them to schedule an appointment which I both dread and fear.
So when they reach that rude threatening point, there's not much you can due but sit back, relax, and take their endless stream of crap. Try using the following expressions to convey feedback for the types of things they tell you until they give you time to talk
If they tell you something about your eyes
If they say something around the lines of "your eyes will get worse if you don't wear glasses"
Some other expressions you will probably find useful
Some other useful tips to make their social engineering scheme hopeless:
1: Never make eye contact.
2: If you somehow make eye contact, never break that eye contact.
3: Make sure they know that your order of glasses is 'To go'
4: Try and take the conversation to unrelated and pointless topics, preferably ones they won't understand (ex: "I think the quantum locking Theroy has some real potential!" or, redirect the conversation to the best eye techniques for finding Waldo.)
5: Ask if they could give your pet a pescription to ruin it's eyes too.
6: Get a pet parakeet and bring him along.
Immature? Yes. Funny? Definitely.