I got my glasses from 39 dollar glasses and I could not see very well. When I looked through my old glasses I could tell that there was a difference in the lenses. When I called customer service they were more than happy to help me with my problem. They sent me a pre-paid envelope to send the glasses back and were happy to make a new pair for me. It turned out the mistake was mine, I put my prescription in wrong! And they were still happy to replace my glasses!!