Well they did have my prescription. Which was low enough (~-5.5 or so for both eyes, ~-1D astigmatism) that there was little doubt about my candidacy. I'm not sure what other "eye health" items were on the initial report though. Optometrists refer people to opthamologists for surgery all the time, whether it be PRK/LASIK, lens exchange (cataracts), etc., so I presume she filled out some pretty standard form for the purpose and sent it to them with a referral note.
It was sort of a leap of faith, because they could have rejected me at any point in the process*, including when I was literally moments away from being lasered (after spending $$$ to get to Vancouver!)**. PRK has a wider range of treatment eligibility than LASIK, but even so, if you have a higher prescription (ie: >-10, or significant hyperopia), you really should have a conversation with your optometrist about your range of options for treatment because even PRK might not be for you***. As an out-of-town-patient, much of the 'counselling' component is left to the co-managing optometrist. In fact, I wasn't even shown the "video" that PLEC typically shows its patients -- I literally walked in there, signed the consent form (which I had been provided a month earlier during the booking process!)/paid the fee, and about an hour later, was lasered, examined, counselled for drops/precautions, and in a cab back to the hotel!
If you're in your early 40s or older, I would add, you really should have a conversation with your optometrist about presbyopia (worsening close-up vision when wearing full-distance correction!) which may include a trial of monovision contact lens correction.
* I could have rejected them as well. PLEC doesn't ask for a booking deposit unlike other clinics.
** One possible reason for rejection could be unreasonable expectations. The Dr. interviewed me as to why I wanted the surgery, what I hoped to accomplish from it, etc. to verify that informed consent existed. If you want, PM me and I'll tell you an amusing anecdote!
*** It is certainly possible that they detect an eye disease, such as kerotaconus/ectasia, etc., that an optometrist may not have detected on their exam, but are detectable with the specialized equipment in the surgeon's office. If this is the case, then you may need to consider some different treatment options which PLEC may or may not be able to provide that day. I think @peanutz unexpectedly required punctal plugs inserted, for example, at a $75 expense to him/her, due to dry eyes.