n=eyes Complication n (%) High clinical significance Choroidalhaemorrhage 2 (0.3%) Malignant glaucoma 2 (0.3%) Total hyphaema 1 (0.2%) Flat anterior chamber Serous retinal detachment 1 (0.2%) 2 (0.3%) Total filtration failure 1 (0.2%) Wipe-out (late) 1 (0.2%) Common Hyphaema 85 (13.4%) Bleb leak 84 (13.2%) Shallow anterior chamber 60 (9.4%) Choroidal effusions 76 (11.9%) Corneal abrasion 21 (3.3%) Sub-conjunctivalhaem. 18 (2.8%) Hypotonymaculopathy 33 (5.2%) Mega-bleb / dysaesthesia 10 (1.6%) Tenon’s capsule cyst 15 (2.4%) Other / rare (<0.5%) & minor astigmatism, clot in osteum, iris to osteum, pupil distortion, corneal oedema, loose or prominent sutures, vitreous haemorrhage, keratopathy, synechiae, high bleb vascularity, transient blebitis 25 (3.9%)

Table 4b: Post-operative complications.