A patient of mine has to have a redo of her henses because her prescription changed drastically. I spend much time to verify that the change is valid and told her the importance to adapt to it! Somehow she couldn't and unfortunately i had to purposely lower it but she won't see as sharp. Good Eyes blames me for giving her wrong numbers and wants the patient or ME to pay for the redo ($150). Sorry but if she were to go to Lenscrafters, Hakim, Pearle Vision, Sears optical (or wherever) they would redo doctor's change NO-CHARGE, NO FUSS. Highly do not recommend this optical or others like it with poor re-do policy for their clients. Btw, i rarely have to re-write my patient's prescription (which is not so straight-forward as you might presume).
Forget your eyes, check your head. If you're prescription changed suddenly I would be worried that you have either a brain tumour, some eye disease or worse. Pac mall stores are like factories.. they sell glasses not sympathy. You got a discount but you can't expect a free pair of lenses whenever your prescription changes.