My prescription had changed and I needed new glasses. I've always required a strong prescription, and I knew it would be a little more expensive than typical. If you have a strong glasses prescription, you may do better going elsewhere than Stanton optical. The 2 for $20 was not available for me, and although they cut the price to the warranty and coating they strongly encouraged me to get, the amount I paid was substantial. Stanton's staff were not very knowledgeable about what frames would work with the lens I have, as I have had to go back three times to get the glasses I needed. Next time I get glasses, I'm going to do more homework.