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Toric intraocular lens performance: comparing biometric direct surgical guidance to intraoperative aberrometry

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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: 15:26

Venue: Room 1

First Author: : J.Solomon USA

Co Author(s): :    F. Tyson   K. Waltz                 

Abstract Details


Compare the efficacy of the Callisto Surgical Guidance system for the reduction of refractive cylinder during cataract/Toric intraocular lens surgery to VerifEye/ORA intraoperative aberrometry.


Bowie Vision Institute, Bowie, MD, USA Eye Surgeons of Indiana, Indianapolis, IN, USA Cape Coral Eye Center, Cape Coral, FL, USA


Prospective, multicenter, non-randomized review of 220 eyes, measured with the IOL Master 700 (Carl Zeiss Meditec) and sequential Baylor corneal astigmatism nomogram adjustment during preoperative cataract analysis. Subsequent cataract surgery with intraoperative alignment of a single-piece Toric IOL platform was guided by the Callisto Guidance System with biometric information transferred from the IOLMaster, or intraoperative VerifEye/ORA aberrometry guidance. Images of the surgical eye were then compared to preoperative images to assess accurate axis identification and IOL alignment. Post-operative refractive cylinder was measured at one month.


Preoperative Astigmatism measured 2.02±0.77 Diopter (D) for the Callisto Group, and 2.22±0.87D for the VerifEye/ORA Group. The average axis marking error was 2.50±1.49 degrees and alignment error measured 1.82±0.74 degrees. Mean residual refractive cylinder was 0.37±0.27 D with 100 %, 93%, 78%, and 51% of eyes ≤ 1.00D, 0.75D, 0.5D, and 0.25D respectively for the Callisto Group, and 0.39±0.29D with 99%, 90%, 74%, and 50% of eyes ≤ 1.00 D, 0.75 D, 0.50 D, and 0.25D, respectively for the VerifEye/ORA Group. The mean absolute error from intended residual astigmatism was 0.26±0.22D and 0.29±0.25D, respectively.


Conclusion:preoperative biometric data channeled through the Callisto Guidance System and the VerifEye/ORA intraoperative aberrometre are comparable at reducing residual astigmatism as part of refractive cataract surgery.

Financial Interest:

One of the authors is employed by a for-profit company with an interest in the subject of the presentation

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