At the appointed time, an ophthalmologic technician did a full screening exam on me. The exam included computer screening of my visual acuity and infrared computer mapping of my cornea shape as well as precise measurements of my pupils. Additionally, a medical history was taken and a detailed history about previous corrections, especially contact lens use, was reviewed. The testing was very complete and took about an hour. An additional test, corneal thickness measurement, was performed since this is critical for the procedure.
Some people have corneas that are too thin for the procedure.
Mine were OK at .571 and .522 mm. Although the FAA does not have specific rules, the agency has published some general recommendations. Practically, most pilots do not do anything until their next AME exam and report the surgery at that time. I have never seen anyone get a letter from the FAA asking for an ophthalmology form to be filled out when they passed the vision requirement while reporting the surgery in the history area. Given the backlog at the FAA's OKC medical office, they probably do not want to deal with minor issues like this at this time.