Irrigating bent ab-interno needle goniectomy (i-BANG) technique.

Background: The bent ab-interno needle goniectomy (BANG) represents a low-cost indigenous modification designed for ab-interno excisional goniectomy. This technique employs a reverse cystitome (24 G needle) and yields outcomes equivalent to those achieved with the Kahook Dual Blade goniectomy. However, reflux bleeding from Schlemm's canal, with or without anterior chamber shallowing, often impedes angle visualization, thereby limiting the desired treatment extent.