26doc064 10.3205/26doc064 urn:nbn:de:0183-26doc0643 Meeting Abstract Englisch Englisch Colya C

Augenklinik Sulzbach, Sulzbach

author Wakili Wakili Philip P

Augenklinik Sulzbach, Sulzbach

author Aristodemou Aristodemou Petros P

Cellular and Molecular Medicine, University of Bristol, Bristol, Vereinigtes Königreich

author Kontos Kontos Andreas A

Kontos Eye Clinic, Limassol, Zypern

author Langenbucher Langenbucher Achim A

Universität des Saarlandes, Institut für Experimentelle Ophthalmologie, Homburg

author Messias Messias André A

Augenklinik Sulzbach, Sulzbach

author Chkhaidze Chkhaidze Konstantine K

Universitätsklinikum Ulm, Klinik für Augenheilkunde, Ulm

author Wolf Wolf Armin A

Universitätsklinikum Ulm, Klinik für Augenheilkunde, Ulm

author Szurman Szurman Peter P

Augenklinik Sulzbach, Sulzbach

author Boden Boden Karl T. KT

Augenklinik Sulzbach, Sulzbach

author Vounotrypidis Vounotrypidis Efstathios E

Universitätsklinikum Ulm, Klinik für Augenheilkunde, Ulm

author German Medical Science GMS Publishing House

Düsseldorf

610 20260617 engl This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). M0651 064 38. Internationaler Kongress der Deutschen Ophthalmochirurgie (DOC) Katarakt II Nürnberg 20260618 20260620 FP 6.6 TextPurpose: To investigate vectorial astigmatism time course and identify its predictors following combined phacoemulsification and pars plana vitrectomy. Methods: This multicenter retrospective cohort study included 1,041 eyes from 1,041 patients undergoing phacovitrectomy at four centers. Eyes with macula-off retinal detachment, prior vitreoretinal surgery, silicone oil endotamponade, or postoperative CDVA worse than 0.4 (decimal) were excluded. One eye per patient was analyzed. Preoperative astigmatism was derived from keratometry and corrected using the Abulafia–Koch method, while postoperative astigmatism was obtained from refraction. Astigmatism was vectorially decomposed into J0 and J45 components. Changes over time were assessed using multivariate repeated-measures ANOVA, and predictors of ΔJ0 and ΔJ45 were identified using multivariate linear regression. Results: The orthogonal astigmatism component (J0) decreased from +0.62 ± 0.38 D (95% CI: 0.60 to 0.64) preoperatively to +0.05 ± 0.45 D (95% CI: 0.02 to 0.08) postoperatively, while the oblique component (J45) increased from 0.003 ± 0.25 D (95% CI: -0.01 to 0.02) to +0.04 ± 0.30 D (95% CI: 0.02 to 0.05), indicating a systematic vectorial shift (p <0.001, ηp² = 0.349). The final regression models demonstrated high predictive accuracy, explaining 88.5% of the variance in ΔJ0 (adjusted R² = 0.885, SEE = 0.267, p <0.001) and 83.5% of the variance in ΔJ45 (adjusted R² = 0.835, SEE = 0.205, p <0.001). Baseline astigmatism was the dominant predictor in both models. Axial length, incision site, and incision meridian significantly predicted ΔJ0, while laterality, incision size, and incision meridian significantly predicted ΔJ45 (all p <0.001). Endotamponade type and gauge size showed no relevant effect. Conclusions: Phacovitrectomy induces minimal but statistically significant changes in astigmatism, characterized by a reduction in with-the-rule component and a small induction of oblique astigma-tism. These changes are highly systematic and predominantly determined by incision characteristics and baseline astigmatism rather than intraocular factors. 0 0 0 0