That may be, but for glasses at least a key measurement is pupillary distance, and it is like pulling teeth to get them to give you this. At my most recent encounter with an optometrist - where I had already selected and was in the process of purchasing from them glasses that cost me hundreds of dollars after my insurance discount - I had to ask them no less then four times to write down my PD so I could buy a few pairs of beaters online. They kept "forgetting."