LASIK outcomes tend to shift toward undercorrection over time. Postoperative ectasia was not noted 7 to 8 years after LASIK. All patients were satisfied with the postoperative results although emmetropia was not reached. [J Refract Surg. 2009;25:312-318.]
With this information, it may be worth it to overcorrect a patient about -0.50 to -0.75 D originally to accommodate for this shift. However, more studies should confirm these findings.