I’ve bought 2 pairs of IOLLA glasses and these are the best glasses I’ve ever had! I was a bit sceptical because they cost so little in comparison to opticians so I wondered about quality and comfort but I was not disappointed and there’s no more buying glasses for me at opticians. IOLLA all the way. I also had concerns with thinning of lenses in one pair of the IOLLA glasses because in the past when I had lenses thinned at opticians I couldn’t see, and had to revert back to standard lenses, so not sure how IOLLA did it but thinning of the lenses in my Rowling frame works great! I have no issues with my vision at all. I very much recommend IOLLA, service is great also:)