Koivusalo R, Välimäki J, et al. - In this prospective study, researchers analyzed the impact of glaucoma drainage implant (GDI) surgery on corneal topography during the first postoperative year. For this investigation, 21 adult glaucoma patients have been implanted with a Molteno3 or a Baerveldt 250 GDI. The mean ± SD simulated average keratometry values were 44.36 ± 1.69 D, 44.08 ± 1.29 D and 44.15 ± 1.32 D before and 6 and 12 months after surgery, respectively, in the surgical group. Data reported that the corresponding simulated keratometry astigmatism values were 1.11 ± 1.11 D, 1.20 ± 1.01 D and 1.16 ± 0.71 D. The mean endothelial cell density (ECD) had reduced by 8% centrally and by 9% peripherally at 12 months postoperatively. Glaucoma drainage implant (GDI) surgery did not significantly alter the parameters of corneal keratometry and thus appears to be a neutral astigmatic procedure. However, a slight increase in CCT was observed after GDI implantation, although apparently transient.