Comparative analysis of clinical outcomes obtained with a new diffractive multifocal toric intraocular lens implanted through two types of corneal incision
Abstract
To analyze and compare the clinical outcomes obtained after cataract surgery with the implantation of a new multifocal toric intraocular lens (IOL) using two different types of corneal incision. Retrospective study including 64 eyes of 35 patients who underwent surgery with implantation of the AT LISA 909M multifocal toric IOL (Carl Zeiss Meditec) in 2 different ophthalmologic centers using different criteria for corneal incision size: sub-1.8 mm (micro-incision surgery [MICS] group) and 2.2 mm (mini-incision group).
Visual, refractive, and corneal topographic outcomes were evaluated during 6-month follow-up. Additionally, refractive astigmatic changes were analyzed using the Alpins vectorial method.
Significant reductions of refractive sphere and cylinder were observed postoperatively (P<.03), with associated visual improvements for near and distance (P<.01) in both groups. Mean postoperative magnitudes of difference vector, torque, and magnitude of error in the overall sample were 0.52 +/- 0.36 diopters (D), 0.36 +/- 0.36 D, and 0.08 +/- 0.38 D, respectively.
A mean overcorrection of 4% in refractive astigmatism was found. Mean angle of error was 0.37 +/- 5.50 degrees and -4.51 +/- 13.16 degrees for the MICS and mini-incision groups, respectively (P=.09).
Significant positive correlations were found between the magnitudes of torque and difference vector (r=0.78, P<.01) as well as between the magnitude of torque and absolute angle of error (r=0.76, P<.01). Implantation of the AT LISA toric IOL using corneal incisions <2.2 mm provides excellent predictability for astigmatic correction.