Fig. 6.

Intra-operative images of sub-conjunctival haemorrhage during XEN implantation Courtesy of Leonard W. L. Yip, FRCSEd and Bryan C. H. Ang, FRCOphth, Singapore. a, b Development of sub-conjunctival haemorrhage during XEN implantation obscuring view of emerging stent. c Good visualisation of the XEN gel stent at the beginning of a needling procedure. d Poor visualisation of the XEN gel stent as needling progresses, due to sub-conjunctival haemorrhage and rising of the bleb. e Ab-externo XEN implantation in an eye undergoing open revision after prior XEN implantation, as the previous stent was found not be patent during surgery