Can LASIK correct a 5.0 diopter astigmatism?

I have had success in correcting high levels of astigmatism (over 5 diopters) but not using the wavefront technology.  This is especially true for patients who have had RK in the past.  But, on certain patients, re-treatment of the astigmatism is necessary.  This is all dependent upon the patient having a thick enough cornea to start and a reasonable corneal curvature.  One of the great success stories here is a patient who had residual astigmatism after a corneal transplant.  In that case, I was able to correct his astigmatism using PRK which is also a great option.
 

I would recommend that you see an experienced ophthalmologist in your area to evaluate if LASIK is appropriate for you. Larger astigmatic corrections are sometimes associated with an uncommon condition called keratoconus. I have treated many high astigmatic patients with great success. Each treatment needs to be evaluated on a case by case basis.

LASEK corrects extreme astigmatism better than LASIK because the flap masks the new surface and doesn't perfectly conform to it This is why you often get striae or flap wrinkles after extreme LASIK corrections. Because you're only changing the shape of the bed. Not the flap you then try to replace The flap wrinkles can cause double vision You also need an Orbscan or Pentacam to make sure you don't have Keratoconus for that high a degree of astigmatism Good luck and hope this helps