Hej Tordan,
found this on the website of some eye surgeon, regarding LASIK refractive surgery:
Your prescription must be within certain limits. For example, very high amounts of myopia, which would require removal of too much corneal tissue, may preclude LASIK
Of course I'm not a medic so I really don't know if this actually is the idea behind the limit ...
Anyway: good luck with your medical!
And oh yes ... I had to check the spelling of the ophthalwhatever too!