My Aura lenses are thicker than the Phillips glasses I had. And they are heavier. But I don't notice any difference when they are on my face. I do notice a difference after I quit torching. I can see much better after using my Aura lenses than I could when I was using my Phillips. With Phillips (bought in I think 2003?) I had an hour or two after getting off the torch where my vision was noticeably impaired. That's one of the reasons I switched.