Table 2.

Frequency of complications following Xen surgery (n = 259)

Complication	Frequency, n (%)
Numerical hypotony (IOP <6mmHg)	90 (34.7)
IOP spike (≥30mmHg)	33 (12.7)
Transient Xen occlusion e.g. iris, blood (causing IOP ≥20mmHg)	10 (3.9)
≥2 Snellen lines vison loss lasting >1 month	9 (3.5)
Large dyaesthetic bleb	6 (2.3)
Xen exposure	6 (2.3)
Hypotonous maculopathy	5 (1.9)
Choroidal effusion lasting >1 month	4 (1.5)
Endophthalmitis	1 (0.4)
Central retinal vein occlusion	1 (0.4)
Cyclodialysis cleft	1 (0.4)