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First Author: A.Assaf EGYPT
Co Author(s): A. Hashem
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To compare visual acuities, astigmatic correction, and higher order aberrations after implantation of Tecnis toric intraocular lens (IOL) (Abbott Medical Optics) with Acrysof IQ toric IOL (Alcon Laboratories Inc) to correct astigmatism during cataract surgery.
Al-Watany Eye Hospital, Ain Shams University, Cairo-Egypt
Prospective randomized controlled study. Patients with senile cataract and regular corneal astigmatism from 1 to 3 diopters (D) who underwent phacoemulsifiction were included. Patients were randomized into two groups: one group received Tecnis toric IOL (A, case) while the other group received Acrysof IQ toric IOL (B, control). Study parameters included residual refractive astigmatism, spherical equivalent, defocus equivalent, rotational stability. Higher order aberrations included spherical aberration, coma, trefoil, modulation transfer function (MTF) and point spread function (PSF) measured by optical path difference scanning system (OPD scan III, NIDEK Co Ltd). Follow up extended to 3 months postoperatively.
Each group comprised 23 eyes. Both groups showed no statistical significant differences regard residual refractive astigmatism, spherical equivalent, defocus equivalent. Rotational stability was similar in both groups (3.27Ḟḟ2.91Ḟ and 3.11Ḟḟ2.74Ḟ in groups A and B respectively). While corneal spherical aberration was similar in both groups, total spherical aberration was significantly lower in group A (0.01ḟ0.11? in group A, and 0.13ḟ0.2? in group B, P=0.043). Total ocular coma and trefoil were higher in group B but without statistical significant difference. Total PSF was tighter and MTF was higher in group A.
Both IOLs showed promising astigmatic correction with excellent postoperative rotational stability. Although in group A, total spherical aberration was significantly lower and PSF was tighter, further studies include contrast sensitivity (CS) testing are warranted to compare subjective visual quality of both lenses.