Purpose: To compare the two-year outcomes of non-penetrating deep sclerectomy (NPDS) and Ex-PRESS glaucoma shunt.
Methods: A retrospective chart review of patients who had undergone NPDS or Ex-PRESS since 2012 was conducted. Patients were excluded if they had undergone eye surgery other than cataract extraction, were diagnosed with ocular pathology other than glaucoma or had less than two-year follow-up. Pre- and postoperative visual acuity, intraocular pressure (IOP), number of hypotensive drugs and visual fields were recorded, as well as intra- and postoperative complications.
Results: Thirty-nine eyes were included in the NPDS and twenty-three eyes in the Ex-PRESS group. There were no differences in baseline IOP and hypotensive drugs, IOP reduction or postoperative IOP-lowering medications between groups. Two years after surgery, IOP decrease compared to baseline was 23.5% with NPDS and 24.8% with Ex-PRESS. Qualified success (a 20% IOP reduction, with IOP ≤ 18 mmHg with or without medication) rates were similar: 53.8 and 69.6% for NPDS and Ex-PRESS. Visual fields progressed in four eyes of the NPDS (10.2%) and in three eyes (8.7%) of the Ex-PRESS group. As regards complications, early hypotony was more frequent after NPDS (9 eyes, 23.1%) than Ex-PRESS (2 eyes, 8.7%), although the difference was not statistically significant.
Conclusions: Both NPDS and Ex-PRESS produce an IOP-lowering effect of approximately 25%. Success rates are similar after both procedures, and both seem to lead to a stabilization of visual loss.
Keywords: Ex-PRESS glaucoma shunt; Glaucoma surgery; Non-penetrating deep sclerectomy; Visual field progression.