Why carry out this study?

To our knowledge this is the first detailed report of the steps, outcomes and complications of Xen revision surgery with 12 months of follow-up.

We explain the indications for Xen revision surgery and the steps of the procedure.

What was learned from the study?

Data from our small cohort show that Xen revision surgery can achieve intra-ocular pressure (IOP) outcomes similar to those achieved in primary Xen implantation.

A proportion of patients will still require needling following Xen implant surgery or adjunctive IOP-lowering drops in order to achieve their target IOP.