Total vessel area of a filtering bleb was measured with ImageJ software on colour photographs of a filtering bleb on day 1, 14, 1, 3 and 6 months and 1 year after trabeculectomy. Blebs were classified clinically as successful (IOP below 18 mmHg and a \>30% reduction in IOP without antiglaucoma medications or additional surgical interventions) or failed. Linear regression analysis was performed to determine the correlation of the bleb vascularity with IOP.
