Effect of a single-piece aspheric hydrophobic acrylic intraocular lens design on centration and rotation

PurposeTo assess the rotation and centration stability of the new design features of a 1-piece aspheric hydrophobic acrylic intraocular lens (IOL).SettingNational Eye Hospital, Cairo, Egypt.DesignRandomized clinical trial.MethodsPatients in this study had implantation of a 1-piece Tecnis 1 ZCB00 IOL or a 3-piece Sensar AR40e IOL. Decentration and rotation were recorded immediately postoperatively, and 2 to 3 days and 8 weeks postoperatively. This was done using 2 slitlamp eyepieces and referring to constant corneal landmarks (ie, the limbus and the phaco incision).ResultsThirty-two 1-piece IOLs and 30 3-piece IOLs were implanted. Although the 1-piece IOLs moved toward the corneal center more than the 3-piece IOLs between 3 days and 8 weeks postoperatively (P=.054), the difference was not statistically significant between 0 day and 3 days or during the entire follow-up (P=.546 and P=.367, respectively). There were no statistically significant differences in the horizontal or vertical components of this movement between the 2 groups (P=.883 and P=.636, respectively). The mean rotation was 2.5 degrees ± 9.1 (SD) in the 1-piece IOL group and 0 ± 6.5 degrees in the 3-piece IOL group, with no statistically significant difference between the groups (P=.521).ConclusionThe new 1-piece design showed relatively good centration and stability in the horizontal, vertical, and rotational aspects.Financial DisclosureDrs. Roshdy, Riad, Morkos, Hassouna, and Wahba receive travel support from Abbott Medical Optics, Inc., Santa Ana, California, USA; Drs. Riad, Morkos, and Hassouna have equipment provided by Abbott Medical Optics, Inc., and Alcon Laboratories, Inc., Fort Worth, Texas, USA. No author has a financial or proprietary interest in any material or method mentioned.