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Optimising A-constants for combined phacovitrectomy surgery with ILM-peeling

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Session Details

Session Title: Glaucoma & Posterior Segment

Session Date/Time: Monday 24/09/2018 | 08:00-10:30

Paper Time: 09:54

Venue: Room A3, Podium 1

First Author: : E.Vounotrypidis GERMANY

Co Author(s): :    J. Langer   S. Freissinger   N. Hirnschall   M. Shajari   S. Priglinger   W. Mayer     

Abstract Details


To improve refractive outcomes of combined phacovitrectomy with ILM-peeling in terms of cataract and vitreoretinal diseases.


Department of Ophthalmology, Ludwig-Maximilians-University Munich, Germany.


49 eyes of 49 patients with age-related cataract and epiretinal membrane underwent combined micro-incision cataract surgery (CT Asphina 409M, Carl Zeiss Meditec) and 23g vitrectomy with ILM-peeling. Objective and manifest refraction, CDVA, swept-source OCT-based biometry and macular OCT examinations were performed pre- and 3-months postoperatively. 31 eyes of 31 patients with age-related cataract underwent cataract surgery alone (same IOL) and served as controls.Three groups were established: Phacoemulsification with optimised constants (A), phacoemulsification with constants from combined surgery (B), combined surgery (C). Prediction error and absolute error with Haigis, SRK-T, Hoffer-Q and Holladay I formulas were calculated and compared between groups.


Mean axial length was 24,12mm in the combined surgery group and 24,72mm in the cataract surgery group (p=0.123), mean keratometry 43,13D and 43,3D, respectively (p=0.553) and anterior chamber depth 3,24mm and 3,34mm, respectively (p=0.271). The comparison between the three groups revealed, no statistical significant differences between groups A and B regardless the used biometric formula (p>0.05). On the other hand, the comparison between groups A and C revealed a statistically significant difference with all 4 tested biometric formulas (p<0.05). All applied biometric formulas performed equally good (p=0.248, Friedman-test).


In case of combined phacovitrectomy, optimising the a-constants of the implanted IOL is beneficial compared to using phacoemulsification only optimised a-constants, regardless the used biometric formula.

Financial Disclosure:


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