ALPI was applied with a VISULAS diode laser of 532 nm (Carl Zeiss Meditec, Dublin, CA) by the same ophthalmologist (JML). Twenty to 40 spots of 400 mW power with 500 microns of size and duration of 500 ms were applied. Power was modified arbitrarily until an effective iris contraction was obtained. It was considered an effective contraction as that which causes a concentric movement around the laser spot, with minimal iris pigmentation and immediate angle opening observed through the lens mirrors using a Goldmann lens. Power was lowered if there was any bursting sound perceived, pigment dispersion, air bubbles or considerable pain. Pilocarpine was not applied before the procedure in all cases because some eyes had angle closure secondary to ciliary block and we considered it could worsen the closure in many cases.