In this video, a patient presenting with an obstructed trabeculectomy bleb has a revision performed using an ab externo bleb needling approach. The procedure begins by inserting a corneal traction suture for improved access to the scarred bleb and is followed by the insertion of an infusion canula providing a continuous source of balanced salt solution. A bent 25- or 27-gauge needle is then used to carefully disrupt the scar tissue within the bleb. The procedure concludes with the injection of mitomycin-c, an anti-fibrotic agent that aims to promote the longevity of the cleared bleb.
