IOL Calculation in Vitreoretinal Pathology and Surgery

Intraocular lens (IOL) power calculation is frequently performed in the context of retinal pathology and concomitant vitreoretinal surgery. The precision of the regular biometric measurements and calculation formulas can be affected unless the surgeon avoids the different sources of error. In this chapter, the biometry of the eye with retinal pathology is described exposing the most relevant causes of an incorrect measurement and the ways to avoid or correct them. Previously, vitrectomized eyes, especially filled with silicone oil, were more prone to error, and both the measurements and the refractive target have to adapt to the particularity of the eye. Phacovitrectomy has become a routine surgery with increasing demands in refractive outcomes which forces the surgeon to perform a precise calculation with the latest formulas.