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Decentration and Rotation of PC-IOLs
Biro Z., Kovacs K.,
Medical University of Pecs, Department of Ophthalmology (Pecs)
Purpose: To examine the amount and frequency of decentration and rotation of different types of foldable posterior chamber intraocular lenses (PC-IOLs) (Medicontur-HM601HP, Storz-Hydroview, Alcon-AcrysofMA60, Pharmacia-CeeOn911).
Methods: One hundred eyes of 100 patients were examined, after uneventful phacoemulsification and PC-IOL implantation at least 6 months ago (6-44 months, average 13.7 months). All the PC-IOLs was implanted in-the-bag during surgery, with the long axis in the horizontal level. Minimum six months after the surgery the centration of PC-IOLs were compared to the pupil margin after dilation of the pupil. According to literature data, more than 0.5mm shift was considered as decentration. The amount of rotation of PC-IOLs was compared to the horizontal line.
Results: Comparing the different types of PC-IOLs, there was no significant difference in the amount of postoperative decentration, which was found in 4 % of the cases. The small number of cases can explain this. In most of the cases there was a minimal rotation of less than 10°. However rotation of more than 30° was observed as well, and this could be observed mostly with the Acrysof IOL.
Conclusions: Postoperative rotation of in-the-bag implanted PC-IOLs has less importance in spherical IOLs, however, its importance may increase with the widespread use of toric lenses for the intraoperative correction of astigmia.