Characteristics Of Surgically Induced Astigmatism After Standardized Microincisional Cataract Surgery With A Superior Limbal Incision

Published 2022 - 40th Congress of the ESCRS

Reference: PP04.16 | Type: Free paper | DOI: 10.82333/ad75-qg49

Authors: Marina Casazza* ¹ , Jascha Wendelstein ² , Barbara Fuchs ² , Nino Hirnschall ² , Siegfried Mariacher ² , Kamran Riaz ³ , Matthias Bolz ² , Landon Hester ⁴

¹Department for Ophthalmology and Optometry ,Kepler Universitätsklinikum Linz,Linz ,Austria, ²Department for Ophthalmology and Optometry,Kepler Universitätsklinikum Linz,Linz,Austria, ³Department for Ophthalmology ,Dean McGee Eye Institute / University of Oklahoma,Oklahoma City,United States, ⁴Health Science,University of Oklahoma ,Oklahoma City ,United States

Purpose

This study aims to compare the results of surgically induced astigmatism (SIA) derived from anterior (K) and posterior (TK) corneal measurements.

Setting

Department of Ophthalmology, Kepler University Hospital, Linz, Austria

Methods

Medical records of patients who had undergone cataract surgery between October 2018 and October 2021 were reviewed. To compare the results of SIA, corneal power (K and TK) and SIA (K and TK) were decomposed in two fashions: 1) astigmatism magnitude and meridian were converted into cartesian coordinates X and Y and 2) a conversion of astigmatism magnitude and meridian into the power vector at the 0°/90° meridian J(0) and at the 45°/135° meridian J(45) was applied and compared.

Results

497 eyes of 328 patients were included in this retrospective study. In right eyes the corneal SIA based on K values was 0.47 ± 0.32 D and 0.51 ± 0.38 D in left eyes retrospectively. Based on TK values, corneal SIA in right eyes was 0.51 ± 0.33 D and 0.55 ± 0.40 D in left eyes. There were statistically significant differences in K and TK values in cartesian coordinates X and Y (p<0.05).

Conclusions

Posterior corneal radii measurements are important to increase the accuracy of calculated surgically induced astigmatism.