Does laser eye surgery prevent me from getting an EASA pilot licence?
LASIK is a type of refractive eye surgery and according to EASA's medical standards, you can be considered "fit" to fly after surgery if several conditions are met. The conditions depend on the class of medical; private pilots usually have a class 2 medical.

For class 1:


  (1)   After refractive surgery,  a fit assessment may be considered,
  provided that:
  (i)    pre-operative refraction was not greater than
  +5 dioptres;
  (ii)  post-operative stability of refraction has been achieved (less than 0.75  dioptres variation diurnally);
  (iii) examination of the eye shows no post-operative complications;
  (iv)  glare sensitivity is within normal standards;
  (v)   mesopic contrast
  sensitivity is not impaired;
  (vi)   review is undertaken by an eye
  specialist.


For class 2 (private pilot) and LAPL:


  After refractive surgery a  fit assessment may be considered provided
  that there is  stability of refraction, there are no postoperative
  complications and no increase in  glare sensitivity.


The LBA also has an FAQ on vision issues but it doesn't mention LASIK. It does say, however, that you need an optician to examine you if there are any questions about your vision that an aviation examiner can't determine himself (nicht durch den flugmedizinischen Sachverständigen durchgeführt werden können). I assume that means that if there's any doubt about your eyes, you'll need to have an additional eye exam.