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Verion vs manual marking and smartphone-assisted manual marking in toric IOL implantation

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Session Details

Session Title: Toric IOL Calculations & Alignment

Session Date/Time: Sunday 23/09/2018 | 08:00-10:00

Paper Time: 09:20

Venue: Room A5

First Author: : Z.Khatib INDIA

Co Author(s): :    S. Haldipurkar   V. Shetty   M. Setia              

Abstract Details


To compare the accuracy of isolated manual marking and smartphone gyroscope assisted manual marking with the gold standard Verion Image guided system for toric IOL implantation.


Laxmi Eye Institute, Navi Mumbai


The study was a prospective observational study done on 42 eyes of patients undergoing cataract surgery with toric IOL implantation. Patients were preoperatively registered and photographed on the Verion Image guided system. In the operating room, patients were reference marked at the 6 o clock limbus (90 degree) on slit lamp in sitting position. Using the smartphone gyroscope through an android app- iToric, the axis of the mark was noted, following which the patient was taken on the operation table where the mark axis was confirmed with Verion digital overlay on an external screen.


The mean angular deviation between manual mark axis (90 degrees) and Verion axis, and between smartphone assisted axis and Verion axis was calculated. Mean angular deviation in degrees between the manual mark axis and Verion overlay axis was 4.66. The mean angular deviation in degrees between the smartphone assisted mark axis and the Verion overlay axis was 2.62, which was significantly lower than the previous group (p value 0.012). Moreover, the average Intraclass Correlation Coefficient (ICC) between the smartphone axis and Verion axis was 0.88 indicating a good correlation.


For cataract surgery with toric IOL implantation, preoperative marking with smartphone gyroscope assisted marking significantly improves accuracy over isolated manual marking. Smartphone assisted marking correlates well with the gold standard Verion digital image overlay for toric IOL implantation.

Financial Disclosure:


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