ABSTRACT
Objective To evaluate the accuracy and validity of Toric intraocular lens (IOL) alignment by VERION image guided system.Methods In this retrospective study,75 eyes of 75 patients who underwent phacomulsification combined with Toric IOL implantation were enrolled from June 2016 to May 2017.Before operation,anterior segment images of all patients were collected using VERION image guided system,and target axis of IOL implantation was set.Horizontal axis was marked using 1 mL syringe needle under the slit lamp.During the procedures,the IOL was implanted referring to the target axis under VERION system or the slit lamp randomly,and there were 42 eyes with IOL implantation guided by VERION system (VERION group),and 33 eyes guided by slit lamp (slit lamp group).The best corrected visual acuity (BCVA) of each patient was recorded at day 1,1 week,1 month,and 3 months after operation.Anterior segment images were taken after mydriasis,and all the images were analyzed by Photoshop software.Finally,the BCVA at various time points after operation and the deviation value of actual axis and target axis was compared in both groups.Results The proportion of eyes with BCVA ≥ 0.8 at day 1,1 week,1 month,and 3 months after operation was 61.9％,78.6％,71.4％ and 76.2％ in VERION group,respectively,and 69.7％,78.8％,81.8％ and 75.8％ in slit lamp group,respectively,and there was no statistical significance between VERION group and slit lamp group (all P ＞ 0.05).The difference value of target axis marked by VERION system and by slit lamp was (3.04 ± 1.99) °.No significant differences were seen in the IOL actual axis and target axis between the two groups at various time points (all P ＞ 0.05).Conclusion It is accurate and stable of VERION image guided system for toric IOL axis marking.