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Evaluation of static cyclotorsion in cataract surgery using an image-guided system

Poster Details

First Author: H.Lin TAIWAN

Co Author(s):    Y. Fang   P. Lin                 

Abstract Details


To determine the direction and magnitude of cyclotorsion during cataract surgery in patient with indication for multifocal toric or toric intraocular lens implantation and assessment surgically induced astigmatism (SIA) using a VERION image-guided system.


Universal eye center ZhongLi


Sixty eyes with astigmatism more than -0.75 diopters were enrolled in this study between Dec 2014 and March 2015. Standard preoperative examinations were for confirming the axis and diopter of astigmatism were performed in all patients including auto kerato-refractometer KR-8800 (Topcon), optical biometer (Nidek AL-Scan, and Haag-Streit LENSTAR LS-900). Each cataract surgery was performed using CENTURION (Alcon, USA), VERION image guided system (Alcon, USA), and Luxor microscope (Alcon, USA). Surgical procedures were videotaped, and the images of VERION during main wound creation were captured and used for subsequent analysis. Cyclotorsion was recorded as their direction (incyclotorsion, excyclotorsion) and magnitude (degree).


The success rate of image registration using VERION system was 96.7%. Static cyclotorsion was 3.60+- 7.71 degree excyclotorsion (range from 19 degree excyclotorsion and 13 degree incyclotorsion ). There were 15.0% (9/60) eyes within 3 degrees, and 31.7% (19/60) within 5 degree cyclotorsion.


The VERION image-guided system is fundamental to increase the accuracy and efficiency of performing cataract refractive surgery. More than 95% of the static cyclotorsion can be detected and adjusted without pre-operative corneal marking although accurate manual marking is also reliable.

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