We have taken our children to the same doctor at our Costco for years (into adulthood). She is very good! She found a torn retina in my husbands' exam, years ago, and sent him to a specialist to get it corrected (as well as it could be). She is very thorough with him and the kids, since it is hereditary.
Our eye exam for glasses is $55.00, I think. It is $75.00 for eye glass plus contact exam. We have purchased our children glasses at Costco for years, too. Excellent service and products. They will help with cleaning or adjusting any time we go in to shop. One of my kids broke his glasses, last year, and they helped us get them fixed up so he could wear them while we waited for new glasses to come in.
And you don't have to be a member to use the doctor at Costco.