For your refractive error we need to assess you carefully using pentacam, wavescan and perform a dilated retinal evaluation before the final treatment can be decided for you. IntraLase allows correction of higher powers since the flap can be made more precise and is safer in such situations. But a complete examination is necessary before that. We would be aiming at a full correction of your refractive error and not leave a residual power. Other options like ICL (implanatable contact lenses) can also be explored depending on your reports.