A comparison of effectiveness of various marking methods of toric intraocular lens implantation during cataract surgery

Purpose: to evaluate the effectiveness of isolated manual marking, manual marking using a cell phone and digital marking using the VERION system during implantation of toric intraocular lens (IOL) during phacoemulsification. Material and methods. An observational study was conducted, including 70 patients (100 eyes) with diagnosed senile cataract and corneal astigmatism >0.75 D. Isolated manual marking was performed in a sitting position on a 6-hour limbus (manual axis - 90°) using a slit lamp. Manual marking using a cell phone was carried out through the Android application iToric Patwardhan. The digital marking was carried out in the prone position on the external screen using the digital overlay of the VERION axis and was taken as the reference axis. Results. The average absolute angular deviation between the axis of the mobile program and the VERION axis was 1.97°, which is significantly lower than that of the isolated manual marking axis (3.8°) (p=0.05). The correlation coefficient between the axis parameters for mobile marking and the VERION axis parameters was 0.85. Conclusion. Manual marking using a mobile application demonstrates significantly greater accuracy and efficiency than isolated manual marking. The VERION digital system is recognized as a reference method for marking the corneal axis during implantation of a toric IOL.