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Canaloplasty astigmatism changes: a long-term vectorial analysis

Poster Details

First Author: I.Lopes-Cardoso PORTUGAL

Co Author(s):    R. Laiginhas   R. Geraldes   M. Amorim              

Abstract Details


To analyze astigmatism change after canaloplasty and its correlation with intraocular pressure (IOP) during the first postoperative year.


Centro Hospitalar Entre-Douro-E- Vouga (CHEDV) Santa Maria da Feira Portugal


We retrospectively reviewed 185 eyes from patients with open angle glaucoma consecutively submitted to 360-degrees canaloplasty between 1st January 2010 and 31th September 2016. Selected eyes included those submitted to isolated canaloplasty with complete refractive data at one-year follow-up. Primary outcomes included astigmatism and IOP at baseline, first week, at least one intermediate (1-2months/4-8 months) and one year evaluations. Corneal refractive parameters were obtained from autorefractometer lectures (Tonoref II, Nidek, Aichi, Japan). Quantification and vectorial analysis of astigmatism were performed and correlated with IOP at the different follow-up moments.


From 79 eyes submitted to isolated canaloplasty, 30 eyes met inclusion and exclusion criteria. IOP decreased from 22.2±6.5mmHg to 12.9±2.5mmHg one year after canaloplasty ( p<0.001). Astigmatism increased from -1.03±1.14D at preoperative baseline to -5.86±2.41D at the first week ( p<0.01) and then declined to -2.03±1.37D between first and second months (p<0.01), -1.66±1.21D between fourth and eighth months ( p=0.37) and -1.01±1.20D at one year of follow-up ( p=0.13). Long-term changes of astigmatism vectorial components were non-significant (preoperative J0=0.02(0.3)D, long-term J0=0.08±0.5D, Wilcoxon test: p=0.83; preoperative J45=-0.06(0.4)D, long-term J45=-0.2±0.5D, Wilcoxon test: p=0.25)


360-degrees canaloplasty induces transient refractive changes reaching preoperative values at 4th-8th postoperative months. Possible slight decreases of astigmatism can still occur until one year.Our results are of major value given the importance preoperative management of patient expectations regarding visual outcomes and also to help managing transient or permanent refractive changes after surgery.

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