I don't have an IOLLA nearby and this was my first time ordering prescription specs online. I need not have worried, as the instructions for measuring PD were clear, and there's plenty of help on the website and social media. They fit perfectly, I was kept in the know, and delivery was fast. I have a -7ish prescription and glasses can work out expensive, with lens thinning in particular. I am very happy to have found a small, innovative company with nice frames that keep the costs simple and affordable. I might buy myself a second pair, and I'm also eyeing up the clip-ons for my frames (what a good idea). I feel like I've found *my* glasses people!