In order for an IOL to perform optimally, a precisely sized and accurately centered capsulorrhexis is essential. This can be a challenging process which is made more difficult if the pupil dilates eccentrically. To aid with this process a surgeon can use the Kellen Capsulorrhexis Marker. A perfectly centered mark is created by aligning the tips of four non-marking posts with the limbus and gently pressing the 5.5mm ring onto the corneal surface. Using the mark as a guide, the surgeon can produce a centered, predictably sized 5.0mm capsulorrhexis.