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Astigmatism correction outcomes: comparing manual marking method vs Callisto system for alignment in toric intraocular lenses

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Session Details

Session Title: Pseudophakic IOLs: Toric Cataract Surgery Equipment

Session Date/Time: Tuesday 08/09/2015 | 14:00-16:00

Paper Time: 15:38

Venue: Room 1

First Author: : R.Pérez Izquierdo SPAIN

Co Author(s): :    F. Poyales   A. Fernandez   C. Romero   E. Lopez-Artero   N. Garzon        

Abstract Details


To analyze refractive outcomes in astigmatism correction comparing the usual manual marking method versus the alignment using the Callisto system.


IOA Madrid Innova Ocular, Madrid, Spain


We select patients implanted with Acrysof toric SNA60T in 2014. Manual marking was made during the first six months, and Callisto system was used during the last three months in 2014. 36 eyes underwent surgery using the manual marking method and 45 eyes underwent surgery using the Callisto system in order to align the toric intraocular lens (IOL). The mean age, IOL power and toricity, and preoperative and postoperative astigmatism are compared.


Mean age in the manual marking (MM) group was 68,66 ± 2,92, and in Callisto group was 71,82 ± 3,01 (p: 0,139). Preoperative astigmatism was -2,33 ± 0,40 in MM group and -1,90 ± 0,23 in Callisto group (p: 0,06). Mean IOL power was +17,36 ± 2,41 in the MM group and +20,71 ± 1,49 in Callisto group (p: 0,019), and toricity was 4,47 ± 0,49 in MM group and 3,93 ± 0,40 in Callisto group (p: 0,088). Postoperative astigmatism in MM group was -0,42 ± 0,17 and in Callisto group was -0,46 ± 12 (p: 0,6810).


Although there is not an improvement in our outcomes in astigmatism correction, Callisto system makes the process of toric IOL implantation easier and standardized, avoiding transcription mistakes. Furthermore, we save time when surgery is done, as the process of manual marking (making marks, taking the picture, checking the axis of the marks, and marking under the microsocope) is not needed.

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