IOL Power Calculation After Corneal Refractive Surgery

Intraocular lens (IOL) power calculation is affected by the effect of any previous corneal refractive surgery. In this chapter, an extensive analysis of the different sources of error and the correspondent solutions is performed. Corneal shape change and keratometric error are the main contributors to the final refractive error. Incorrect IOL position estimation is another potential cause of error in determined formulas. New corneal tomographers and the use of a correct calculation method will improve the outcomes avoiding the commission of significant errors. A classification of the published methods to be used in these cases with their performance data will allow the surgeon to select the best option in each particular case.