Correlation study of changes in visual acuity, pupil diameter, Kappa angle, and Alpha angle after phacoemulsification surgery combined with multifocal IOL implantation

Abstract Purpose To study the changes and correlation of visual acuity, pupil size, kappa angle and Alpha angle after phacoemulsification combined with multifocal intraocular lens implantation by analyzing the data provided by OPD-ScanIII Optical Path Difference optical path difference analyzer. Methods From March 2020 to October 2021, 35 patients (60 eyes) with cataract who underwent phacoemulsification combined with multifocal intraocular lens implantation were analyzed retrospectively. The changes of pupil size, Alpha angle, Kappa angle and postoperative visual acuity were measured by OPD-ScanIII optical path difference analyzer before and 1 week after operation. The correlation between pupil size, Kappa angle, Alpha angle and distal and near visual acuity was analyzed 1 week and 1 month after operation. Sixteen eyes of cataract patients were followed up for more than one month to study the changes of pupil size, Alpha angle and Kappa angle one week and one month after operation. Results phacoemulsification combined with multifocal intraocular lens implantation significantly improved the visual acuity of the patients, and the pupil size and Kappa angle decreased 1 week after operation, but there was no significant difference between the indexes more than one month after operation and those before operation. There was no significant difference in Kappa angle and Alpha angle before and 1 week after operation, but there was significant correlation between distant visual acuity and Kappa angle in light and dark vision 1 week after operation. There was no correlation between distant visual acuity and Alpha angle and pupil size 1 week after operation. One week after operation, there was no correlation between near and middle visual acuity and Alpha angle, Kappa angle and pupil size 1 week after operation, and there was no significant difference between Alpha angle and Kappa angle and pupil size 1 week after operation. There was no significant difference between Alpha angle and Kappa angle 1 month after operation. Conclusion phacoemulsification combined with bifocal intraocular lens implantation can significantly improve the visual acuity of patients, reduce the size of light and dark pupil and Kappa angle under dark vision in a short time, and recover after long-term surgery. Therefore, phacoemulsification combined with bifocal intraocular lens surgery should not expand the optical related indexes of patients before operation, which may lead to postoperative adverse reactions and decrease satisfaction.