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NGP Paper
NGP Paper - Effect of trabeculectomy on the rate of progression of visual field damage
Effect of trabeculectomy on the rate of progression of visual field damage

Publishing date: December 2022


Author(s): Susanna Friederike Koenig (1,2), Giovanni Montesano (3,4), Clarissa Ern Hui Fang (5), David Paul Crabb (3), Hari Jayaram (5,4), Jonathan Clarke (5,4)

1 Moorfields Eye Hospital NHS Foundation Trust, 162 City Road, EC1V 2PD, London, UK. susanna.koenig@uniklinik-ulm.de.
2 Universitaetsaugenklinik Ulm, Prittwitzstrasse 43, D - 89075 Ulm, Deutschland, Germany. susanna.koenig@uniklinik-ulm.de.
3 Optometry and Visual Sciences, City, University of London, London, UK.
4 NIHR Biomedical Research Centre of Ophthalmology, Moorfields Eye Hospital and UCL Institute of Ophthalmology, London, UK.
5 Moorfields Eye Hospital NHS Foundation Trust, 162 City Road, EC1V 2PD, London, UK.


OBJECTIVES: This study quantifies the effect of trabeculectomy on the rate of progression (RoP) of visual field (VF) damage utilising pre- and post-operative visual function as the outcome instead of surrogate outcomes of success.

METHODS: Clinical and VF data from 199 sequential patients who underwent trabeculectomy between 2015 and 2016 were extracted from the network of sites of Moorfields Eye Hospital NHS Foundation Trust. Of these, we analysed 80 eyes of 74 patients who met our inclusion criteria of at least three reliable VFs before and after surgery (false positive rate <15%). The change in mean RoP (dB/year) was tested using point-wise sensitivity values through a mixed effect model with random effects on both intercepts and slopes. A broken-stick regression of sensitivity over time, with a breakpoint at the day of surgery, modelled the individual change in RoP.

RESULTS: We analysed 10 [9,12] VFs per subject (Median [Interquartile Range]). At surgery, the age was 67 [57, 72] years, mean deviation was -10.84 [-14.7, -5.6] dB and the IOP was 18 [15, 20] mmHg. One year after surgery, the IOP was 10 [8,13] mmHg (p = 0.002). Mean RoP before surgery was -0.94 [-1.20, -0.69] dB/year (Mean [95% credible intervals]) and it was slowed down by 0.62 [0.26, 0.97] dB/year (p < 0.001) after surgery.

CONCLUSIONS: Trabeculectomy leads to a significant reduction in the RoP of VF loss postoperatively.

Eye (Lond). 2022 Dec 7. doi: 10.1038/s41433-022-02312-y.
PMID: 36477728 DOI: 10.1038/s41433-022-02312-y



NGP Papers manager: Carlo Cutolo



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