Glasses Lenses Starting to Delaminate - Lab Refusing to Replace Them. What do?

I need some advice on how to handle a situation with customer service from a company.

I bought some glasses in February of last year. The lenses are now starting to delaminate (the back of the lenses appear to almost be separating from the rest of the lens). Considering how much I paid for the lenses because of my prescription (high-index polycarbonate), I strongly feel like they should last more than a year and a half.

However, the lab that made the lenses is stating that they're now out of warranty because it's been over a year, and that the delamination is probably just due to heat. This is what the optician's office says, anyway. The optician wants me to pay for a new set of lenses and get another eye exam since it's been over a year. My position is that in the 15 years I've been wearing glasses, I've never had this happen. It seems to me like a defect in the lenses or the lab process.

I went back to the optician's office after they called me informing me that the lenses wouldn't be free (after I was assured it was going to be a free replacement). I told them that I'm not sure why they would expect me to continue to use their services if the first time I used them, I'm having issues and they refuse to stand behind their products. They told me that they could have the supervisor from the lens lab call me, and that she could explain it to me. I agreed, and they said that I should get a call from them tomorrow morning.

Am I out of line thinking that I should be able to get a replacement at no cost to me? It doesn't seem like something I should be penalized for. What would be the best way to address this with the supervisor?