You get what you pay for.
My wife was diagnosed with cataracts when we were visiting the United States about 10 years ago. They wanted to do the surgery immediately at about $10,000 per eye. Since we were going home to Japan where our insurance was good, I said no. We located an excellent eye surgeon about 90 minutes away and had an appointment the week after we got back.
He did surgery on the eyes about 18 months apart, allowing the better eye ample time to heal and the poorer eye to "exercise" during the recovery stage. The actual eyesite improvement was better than what had been promised by the California surgeon.
Our bill came to about $400 per eye, including an overnight hospital stay on the second eye.
Bottom line is that you take you chances with any doctor or dentist. Ask for their credentials and check them out before major surgery. Expensive does not necessarily equal better.
Our eye doctor in Japan was not only a great doctor, he was a great person. He turned his clinic over to his associates for one month out of every year to travel to India and train their local doctors in his techniques. His charge for the training was that any doctor who benefited would pay back 10% by performing eye surgery on those who couldn't otherwise afford it.