Table 1.

Pre-revision demographics of the patient cohort

Pre-revision demographics	Values
Mean age (years)	71 (SD 12.6)
Female:male ratio	3:1
Primary diagnosis (no. of patients)
Primary open-angle glaucoma	13
Uveitic glaucoma	2
Pseudoexfoliation	1
Mean time from Xen to revision surgery (months)	9.9 (range 1–38)
Mean intra-ocular pressure (mmHg)	26.1 (SD 8.3)
Mean number of medications	2 (range 1–3)
Mean cup:disc ratio	0.6 (range 0.3–0.9)
Mean visual field mean deviation	− 7.23 (SD 5.8)

SD Standard deviation