I love going to dr Knudson and I always pay for the extra machine that takes a picture of my cornea. And they've been really helpful when I had shingles by my eye. However, I like to buy my eyeglasses on the internet. And while they will give me my prescription, they won't measure me for pupillary distance. Claiming that it's not part of the prescription. But I can't order glasses without it. So they lose a star for that. It requires me to try and figure it out for myself . It has given me the thought that I might need to find a new doctor because I always buy my glasses online.