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Effect of glaucoma drainage implant surgery on corneal topography: a prospective study
Author(s) -
Koivusalo Riku,
Välimäki Juha
Publication year - 2020
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/aos.14247
Subject(s) - keratometer , medicine , ophthalmology , implant , glaucoma , meridian (astronomy) , corneal topography , cornea , cataract surgery , surgery , physics , astronomy
Purpose To study the effect of glaucoma drainage implant ( GDI ) surgery on corneal topography during the first postoperative year. Methods Twenty‐one adult glaucoma patients were implanted with a Molteno3 or a Baerveldt 250 GDI . Corneal topography measurements were taken preoperatively and at 6 and 12 months after surgery. Untreated opposite eyes served as controls. Results In the surgical group, the mean ± SD simulated average keratometry values were 44.36 ± 1.69 D, 44.08 ± 1.29 D (p = 0.266) and 44.15 ± 1.32 D (p = 0.554) before and 6 and 12 months after surgery, respectively. The corresponding simulated keratometry astigmatism values were 1.11 ± 1.11 D, 1.20 ± 1.01 D (p = 0.687) and 1.16 ± 0.71 D (p = 0.177). Posterior astigmatism and posterior average keratometry remained unchanged after GDI surgery as well. The mean ± SD central corneal thickness ( CCT ) was 530 ± 46 μ m, 535 ± 56 μ m (p = 0.049) and 536 ± 45 μ m (p = 0.080) at 0, 6 and 12 months, respectively. A trend towards increased corneal thickness ( CT ) in response to GDI surgery was also seen in both the average peripheral and the tube‐quadrant peripheral CT values. At 12 months postoperatively, the mean endothelial cell density ( ECD ) had decreased by 8% centrally and by 9% peripherally. Corneal topography parameters, CT and ECD did not significantly change in the control group during follow‐up. Conclusion Glaucoma drainage implant (GDI) surgery did not significantly alter corneal keratometry parameters and thus seems to be an astigmatically neutral procedure. However a slight, although seemingly transient, increase in CCT was observed after GDI implantation.