I am in a similar position for you, my pre-op eyesight was -6.5, and is now perfect and I am 2 and a bit years post lasik. The HR people have told me to go ahead and apply and the LASIK issue will be dealt with on a case by case basis.
Unofficially, I think the reason they want your pre-op eyesight to be within a suitable range is to put off having LASIK purely to pass a Class 1 medical.
Also, there is no point lying about LASIK, as it leaves a scar which can be seen by an opthamologist, and you then need to provide proof of your pre-op prescription,