I purchased two pairs of prescription glassed from GlassesShop.com. They took quite a while to arrive, but that was expected. One of the glasses was ok. But the other pair had something seriously wrong. As soon as I put them on, my eyes felt extremely uncomfortable and I couldn't see very well while wearing them. I took them off and inspected them. It appeared that one of the lenses was thicker than the other. I suspect that probably caused the issue, but I cannot tell for certain. I contacted GlassesShop.com to explain the issue and to enquire if they could replace the faulty pair. They asked me to send them a picture of the faulty glasses, which I did. Then they with the quoted text below.
"Thank you for the picture. We have rechecked the issue with our Lab. The different astigmatism on your both eyes will be reflected on your lenses. Due to your strong prescription, the thickness difference of the lenses will be obvious. We did process your glasses to your order details. Also, according to our Lab, the lens thickness will not affect your vision. Concerning your case, please take your glasses to your eye doctors office to have your glasses tested to see if the prescription on the lenses can match up with the one in your order form, then ask them to issue you a letter on their letterhead to prove they were made incorrectly. Once we receive the letter stating glasses were indeed made incorrectly we will remake a new pair of glasses for you at no additional cost or process a full refund to you. We appreciate your understanding on this matter."
I found this quite ridiculous. This was a lot of effort and cost I had to spend to get the glasses replaced. I think they did just just to get me to go away without replacing the defective glasses. I responded that they should ignore my request, which they appeared glad to do. I have had much better experiences with Zenni and Coastal contacts. Neither of them ever sent me a pair of worthless, unusable glasses.